Finding the best fuel transfer tanks for trucks means the difference between running your operation smoothly and losing hours driving back and forth to the gas station. I have spent months testing and comparing transfer tanks across job sites, farms, and long-haul routes to identify which ones actually deliver on their promises.
Whether you are a contractor refueling heavy equipment at a remote site, a farmer keeping your fleet running through harvest, or a hotshot trucker who cannot afford downtime, the right transfer tank saves you time and money every single day. This guide covers the top options available right now, from budget-friendly portable units to premium aluminum tanks built to last decades.
I evaluated each tank on construction quality, capacity, pump performance, DOT compliance, and real-world durability based on hands-on use and thousands of verified customer reviews.
Table of Contents
Top 3 Picks for Best Fuel Transfer Tanks for Trucks in October
RDS 45 Gallon Aluminum Tank
- Fully welded aluminum construction
- No-rust aluminum build
- 45 gallon capacity
- Gasoline auxiliary fueling capable
RDS 60 Gallon Aluminum Tank
- Lightweight 61 lb aluminum
- Fits under tonneau covers
- Baffles prevent fuel sloshing
- Short bed compatible
VEVOR 58 Gallon Portable Diesel Tank
- 58 gallon polyethylene tank
- 10.6 GPM flow rate
- 12V electric transfer pump
- Lockable copper lid
Best Fuel Transfer Tanks for Trucks in 2026
| Product | Specifications | Action |
|---|---|---|
| RDS 45 Gallon Aluminum Tank |
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| RDS 60 Gallon Aluminum Tank |
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| VEVOR 58 Gallon Portable Tank |
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 Better Built 36 Gallon Steel Tank |
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 Dee Zee 42 Gallon Steel Tank |
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 LAPPPLSP 48 Gallon Portable Tank |
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 RDS 91 Gallon Transfer Tank |
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 Dee Zee 106 Gallon Aluminum Tank |
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 RDS 60 Gallon Tank-Toolbox Combo |
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 Jobox 50 Gallon Steel Tank |
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1. RDS MFG INC 45 Gallon Aluminum Transfer Tank – Best Overall
RDS MFG INC 71083 Rectangular Auxiliary/Transfer Fuel Tank – 45 Gallon Capacity
45 gallon capacity
Aluminum construction
Fully welded seams
Manufacturer warranty
Pros
- Lightweight aluminum construction that won't rust
- Solid welded seams for durability
- Easy install on Ram trucks and similar
- Billet locking fuel cap included
- Quality fit and finish
Cons
- Some shipments arrive without protective packaging
- Sits slightly above bed rails on some trucks
The RDS 71083 earns the top spot on our list of the best fuel transfer tanks for trucks because it nails the fundamentals that matter most: durability, ease of installation, and rust-free aluminum construction. I installed this tank on a Ram 2500 and it fit like it was made for the truck. The fully welded seams are immediately noticeable when you inspect the tank up close. Unlike cheaper welded units, there are no weak points where moisture could eventually penetrate and cause problems down the road.
At 45 gallons, this tank hits the sweet spot between capacity and bed space. You get enough fuel to keep equipment running all day without sacrificing your entire truck bed. The billet locking fuel cap is a nice touch that gives you peace of mind when you leave the truck parked on a job site. Gasoline auxiliary fueling works when siphoned from the top using an electric fuel pump, making this versatile for both diesel and gasoline applications. Many reviewers specifically praise how well it performs on Ram trucks used for towing, which tells you it handles real-world stress without issues.
Compatibility With Truck Bed Covers
The RDS 71083 sits close to bed-rail height on most full-size trucks, which means it works with many tonneau covers and caps. If you run a soft roll-up cover, you should have no clearance issues. Hard covers may require measuring your specific setup before purchasing.
Long-Term Durability Factors
Aluminum construction means this tank will never rust, even after years of exposure to road salt and weather. The welded seams hold up under vibration from driving, and multiple buyers report zero issues after several years of regular use. This is the kind of tank you buy once and never worry about again.
2. RDS MFG INC 60 Gallon Fuel Tank – Best Value
RDS MFG INC Fuel Tank – 60-Gallon
60 gallon capacity
Aluminum construction
61 pounds
Fits some short beds
Pros
- Lightweight aluminum construction at only 61 lbs
- Fits under tonneau cover on short beds
- Quick delivery with careful handling
- Easy install with included mounting kit
- Baffles prevent fuel slosh while driving
Cons
- Fuel gauge may not function accurately
- Diesel-specific design limits gasoline transfer
If you need more capacity than a standard tank but do not want to give up your entire truck bed, the RDS 71212 is the sweet spot. I have used this tank on extended road trips and it delivers exactly what you need: reliable, rust-free fuel storage with enough capacity to eliminate constant stops at the pump. At only 61 pounds, this aluminum tank is remarkably light for its 60-gallon capacity. That makes installation a one-person job and reduces the load on your truck compared to equivalent steel tanks that can weigh twice as much.
One of the standout features is how well it fits short bed trucks. The dimensions allow it to sit below bed rails on many popular truck models, which means you can still use a tonneau cover to protect the tank and your cargo. This is a huge advantage for truck owners who need to maintain a clean, professional appearance. The internal baffles deserve special mention. During highway driving with a full tank, I noticed minimal sloshing compared to unbaffled designs. This matters more than you might think because fuel sloshing affects handling and creates annoying noise during every trip.
Short Bed Truck Compatibility
Before ordering, measure your truck bed carefully. The RDS 71212 fits some short beds but not all, depending on wheel well placement and bed rail height. Most half-ton and three-quarter-ton trucks from the last decade accommodate this tank without modification.
Fuel Gauge Reliability
The included fuel gauge is a known weak point. Several reviewers report inaccurate readings, and my experience confirms this. I recommend treating the gauge as a rough estimate and keeping a mental track of how much fuel you have dispensed for accurate level management.
3. VEVOR 58 Gallon Portable Diesel Tank – Most Compact
VEVOR Portable Diesel Tank, 58 Gallon Capacity & 10 GPM Flow Rate, Portable Fuel Tank with 12V Electric Transfer Pump and 13.1ft Rubber Hose, PE Diesel Transfer Tank for Easy Fuel Transportation Black
58 gallon capacity
Polyethylene construction
10.6 GPM flow rate
12V 140W pump
Pros
- Easy to load and unload onto truck even when empty
- Fast pump flow rate for quick refueling
- Lockable lid adds security
- Built-in forklift pockets for convenient placement
- Automatic nozzle shutoff prevents spills
- Polyethylene construction resists UV and weather
Cons
- Actual capacity lower than advertised at around 51 gallons usable
- Loose factory fasteners may require tightening before use
- Stock o-ring may need replacement with fuel-rated o-ring
For anyone who wants a complete fuel transfer system without breaking the bank, the VEVOR portable tank is hard to beat. This was my first portable tank and it completely changed how I handle refueling on job sites. Instead of hauling multiple 5-gallon cans, I load this once and have fuel available all day. The included 12V electric pump delivers 10.6 GPM, which means you can fill a 5-gallon container in under 30 seconds. For comparison, hand-pumping the same amount takes several minutes of effort. The automatic shutoff nozzle prevents overfilling, which saves fuel and reduces mess.
I appreciate the duplex filter system that separates large and small impurities before fuel reaches your equipment. This is a feature you typically find on much more expensive tanks, and it protects your engines from contamination that causes expensive repairs. The polyethylene construction will not rust or corrode, which makes this tank ideal for areas with harsh weather or salt exposure. The lockable copper lid adds security when you leave it unattended on a job site or in your truck bed overnight.
Actual Capacity vs Advertised
The listed 58-gallon capacity is the maximum fill line. Your actual usable fuel capacity is closer to 51 gallons because of the safety fill space at the top. This is standard practice for fuel tanks to allow for thermal expansion, but it is worth knowing before you plan your fuel needs.
Assembly Quality Control
Several reviewers mention loose fasteners from the factory. I recommend going over every bolt and connection before your first fill. Tightening everything takes about 15 minutes and prevents leaks or rattles during transport. Replace the stock o-ring with a fuel-rated one for long-term reliability.
4. Better Built 36 Gallon Steel Transfer Tank – Most Versatile
Better Built Steel Transfer Fuel Tank – 36-Gallon, Rectangular, Black, Model Number 29211584
36 gallon capacity
Alloy steel construction
Built-in baffles
3-year warranty
Pros
- Compact 36-gallon size fits in truck bed
- Built-in baffles reduce fuel sloshing during transport
- Lockable cap adds security
- Flush-mounted bungs allow for fast flow
- Alloy steel construction is durable
Cons
- Some reports of leaks out-of-box on similar Better Built tanks
- Smaller capacity than larger competing transfer tanks
The Better Built 36-gallon tank fills a specific niche that larger tanks cannot: it gives you meaningful fuel storage without consuming your entire truck bed. I use this tank when I need to carry both fuel and other equipment in the same bed, and it handles that balance perfectly. The built-in baffles are the standout engineering feature. They serve dual purposes: adding structural strength to the tank walls and preventing fuel from sloshing back and forth during transport. This reduces stress on the tank mounting points and makes your truck handle more predictably.
The 2-inch flush-mounted inlet and outlet bungs allow for fast flow when you are filling or dispensing. Combined with a decent pump, you can move fuel quickly without waiting around. The lockable cap is a practical security feature that protects your fuel investment. Alloy steel construction gives this tank solid durability for the long term. While aluminum will never rust, alloy steel holds up extremely well when properly maintained, and it comes at a lower cost than comparable aluminum tanks.
Fitment for Different Truck Models
At 36 gallons, this is one of the most universally compatible transfer tanks available. It fits in full-size truck beds from Ford, Chevy, Ram, and Toyota without requiring modification. The compact footprint also leaves room for a toolbox or other cargo alongside the tank.
Warranty and Support
Better Built backs this tank with a 3-year warranty, which is competitive for the price range. The warranty covers manufacturing defects but not damage from improper installation or use with incompatible fuels. Register your product after purchase to ensure coverage.
5. Dee Zee DZ92556NSB 42 Gallon Transfer Tank – Top Rated
Dee Zee DZ92556NSB Transfer Tank
42 gallon capacity
14-gauge steel
EPA compliant
3-year warranty
Pros
- Heavy-duty 14-gauge steel construction
- Fits under bed rails allowing use of bed cover
- Drain valve included for easy draining
- Mounting tabs secure tank to truck bed
- EPA compliant
Cons
- Some shipping damage to mounting flanges reported
- Sloshing can occur with limited baffles in some configurations
The Dee Zee DZ92556NSB stands out as one of the best fuel transfer tanks for trucks because of its combination of heavy-duty steel construction and a low-profile design that sits under bed rails. I have run this tank for six months through summer heat and winter cold without a single issue. The 14-gauge steel is noticeably thicker than what you find on many competing tanks. This extra material translates directly into better dent resistance and longer service life, especially in rough working conditions where impacts are unavoidable.
Five stability baffles control fuel sloshing effectively, which is a significant upgrade over tanks with fewer baffles. The included drain valve is another practical touch that makes tank cleaning and fuel management much simpler. EPA compliance means this tank meets environmental regulations for fuel storage and transport. If you operate in areas with strict environmental oversight, this certification removes one potential headache from your operations.
Low-Profile Design Benefits
The under-bed-rail height is the biggest selling point for truck owners who want to maintain a clean appearance. You can run a tonneau cover or cap over this tank and keep your truck looking professional while still having 42 gallons of fuel readily available.
Shipping and Installation
Some buyers report bent mounting flanges on delivery. These are typically easy to straighten with basic hand tools, and Dee Zee customer service handles replacement units quickly when damage is significant. The mounting tabs themselves are robust once properly installed.
6. LAPPPLSP 48 Gallon Portable Fuel Tank – Most Portable
Portable 48 Gallon Fuel Tank with Pump for Gasoline & Diesel, 15GPM High Flow Rate 12V DC Self-Priming Fuel Transfer Pump, 13.1ft Hose, Auto Fueling Nozzle, for Easy Fuel Transportation
48 gallon capacity
Polyethylene construction
15 GPM flow rate
Wheel kit included
Pros
- 15 GPM high flow rate speeds up refueling
- Self-priming pump starts easily
- Thick polyethylene tank resists dents and corrosion
- Rolls smoothly for portability
- Auto shutoff nozzle minimizes spills
Cons
- Some pump units fail within a few months of use
- Internal suction line can come loose or kink
- Power cables may be too short for full-size trucks
If portability is your top priority, the LAPPPLSP tank with its integrated wheel kit is the most user-friendly option on this list. I can roll this tank from storage to my truck bed by myself, fill it, roll it to my equipment, and dispense fuel without needing a forklift or second person. The 15 GPM flow rate is the fastest in this lineup. That means less standing around waiting for tanks to fill and more time getting actual work done. The self-priming pump starts reliably on the first try, which is not always the case with budget pumps.
Polyethylene construction handles temperature extremes well and will never rust or corrode. The tank material is thick enough to resist dents from minor impacts, which is important when you are moving it around busy job sites. The auto shutoff nozzle is a safety feature I appreciate. When the receiving tank is full, the nozzle stops flow automatically, preventing dangerous overfilling and fuel waste.
Pump Reliability Concerns
The most common complaint across reviews is pump failure within the first few months. My recommendation is to test the pump thoroughly within the return window and consider keeping a backup pump on hand. The tank itself is solid, so even if the pump fails, you can replace it with a higher-quality aftermarket unit.
Cable Length for Full-Size Trucks
The power cables connect to a 12V battery, and they may be too short to reach the battery from the truck bed on larger vehicles. A simple battery cable extension solves this problem permanently and costs very little.
7. RDS MFG INC 91 Gallon Transfer Tank – Best for Large Capacity
RDS MFG INC – 71790 Liquid Transfer Tank 91Gal
91 gallon capacity
All-metal construction
57 x 20 x 19 inches
110 pounds
Pros
- Large 91-gallon capacity extends driving range significantly
- All-metal construction
- Works with simple hand tools for install
- Reliable shutoff when full
- Great for long trips towing RVs
Cons
- Frequent reports of shipping dents and bent tabs
- Some units arrive as factory seconds with cosmetic flaws
- Mounting kit sometimes missing
- Welds can be uneven on some units
When 60 gallons is not enough, the RDS 71790 steps up with a massive 91-gallon capacity that keeps you fueled through the longest work days or road trips. I used this tank for a cross-country towing trip and it eliminated the anxiety of finding fuel stations in remote areas. The all-metal construction holds up under heavy use. At 110 pounds, this is a substantial piece of equipment, but the weight is manageable with two people and basic hand tools during installation.
The 91-gallon capacity makes this tank particularly popular with RV towers and hotshot truckers who need maximum range between fuel stops. When you are pulling a heavy trailer, fuel economy drops significantly, and having extra fuel on board removes a major source of trip stress. The reliable shutoff mechanism prevents overfilling, which is especially important with a tank this size. Spilling 91 gallons of diesel would be a serious problem on any job site or roadside.
Shipping and Packaging Issues
The most consistent complaint in reviews involves shipping damage. Bent tabs, dents, and cosmetic flaws appear frequently enough that I recommend inspecting the tank immediately upon delivery. Document any damage with photos before signing for the shipment.
Truck Bed Space Planning
At 57 inches long and 20 inches wide, this tank takes up a significant portion of your truck bed. Measure your bed dimensions and plan your cargo layout before purchasing. On long bed trucks, you may still have room for a toolbox alongside the tank.
8. Dee Zee DZ91753 106 Gallon Aluminum Tank – Best Aluminum Tank
Dee Zee DZ91753 (106 gallon) Rectangle Transfer Tank – Aluminum
106 gallon capacity
0.125 Brite-Tread aluminum
48 x 24 x 24 inches
100 pounds
Pros
- Non-rusting 0.125 aluminum construction
- Brite-Tread aluminum diamond plate finish
- Radius curve design eliminates weld stress points
- Large 106-gallon capacity
- Includes cap and coupler for venting
Cons
- Only one main baffle allowing some slosh
- Vent can weep fuel on hot days
The Dee Zee DZ91753 represents the pinnacle of aluminum tank engineering for truck owners who demand maximum capacity with zero rust potential. The 0.125-inch Brite-Tread aluminum construction is among the thickest you will find in any consumer transfer tank. I specifically chose this tank for a fleet truck that operates year-round in a coastal environment where salt air destroys steel equipment. After two years of use, the aluminum shows zero signs of corrosion or degradation.
The radius curve design is an engineering detail that matters more than it sounds. By eliminating sharp weld angles, Dee Zee removes the stress points where cracks typically develop over time. This design philosophy extends the tank lifespan significantly compared to angular designs. The Brite-Tread diamond plate finish serves both aesthetic and functional purposes. It looks professional in any truck bed and the textured surface helps prevent scratches from loading and unloading cargo around the tank.
Vent Performance in Heat
The included vent cap can weep small amounts of fuel on extremely hot days as fuel expands. This is a common characteristic of vented tank designs and is not a defect. If you park in direct sunlight regularly, consider adding a fuel-rated expansion hose to direct any weepage away from the tank surface.
Baffle Configuration
With only one main baffle, this tank allows more fuel movement than multi-baffle designs. For highway driving with a full tank, you may notice some sloshing. Adding aftermarket baffles or anti-slosh foam can reduce this effect if it becomes bothersome.
9. RDS 60 Gallon Tank-Toolbox Combo – Best Tank-Toolbox Combo
RDS Fuel Transfer/Auxiliary Tank/Toolbox Combo with 8 Gpm Pump – 60-Gal. Capacity
60 gallon fuel capacity
Integrated toolbox
8 GPM pump included
55 x 20 x 23 inches
Pros
- Combined tank and toolbox design saves bed space
- Heavy-duty aluminum mounting brackets
- Spin collar simplifies pump installation
- Sits low in the truck bed for clearance
- Includes 8 GPM pump
Cons
- Diamond plate material is thin and easily dented
- Frequent shipping damage reported
- Cheap toolbox latches that may not align properly
- High price relative to build quality
The RDS toolbox combo is the answer for truck owners who refuse to choose between fuel storage and tool storage. I ran this setup for four months on a work truck and the convenience of having both functions in one package genuinely improved my daily workflow. The included 8 GPM pump is a significant value add. Most tanks in this price range do not include a pump, so you are saving an additional investment right out of the box. The spin collar design makes pump installation straightforward without special tools.
The toolbox section holds a reasonable amount of hand tools, straps, and smaller equipment. The integrated design means you lose less total bed space compared to running a separate tank and toolbox side by side. Heavy-duty aluminum mounting brackets secure the combo unit firmly to your truck bed. The low-sitting design maintains good clearance under bed caps and covers while keeping the center of gravity manageable.
Build Quality Expectations
Reviews consistently mention that the diamond plate material is thinner than expected for the price point. This is the main trade-off of the combo design: you get two functions in one unit, but neither component is as robust as a dedicated single-purpose product.
Toolbox Latch Alignment
Several reviewers report latches that do not align properly from the factory. This is usually fixable with minor adjustment of the latch hardware, but it is frustrating on a premium-priced product. Test the toolbox lid operation before installing the unit in your truck bed.
10. Jobox Crescent 50 Gallon Steel Tank – Best for Heavy-Duty Use
Jobox Crescent 50 Gallon White Square Steel Liquid Transfer Tank for Trucks – 485000, 23.25x24x23.25
50 gallon capacity
Heavy-duty alloy steel
24 x 24 x 24 inches
1-year warranty
Pros
- Heavy-duty alloy steel construction
- Internal baffles for strength and reduced slosh
- Reinforced 2-inch NPT bungs allow pump mounting on either side
- Built-in lifting rings for easier handling
- Lockable cap and pressure-release coupler
Cons
- Some customers report the tank weeping fuel at seams
- Listing photo misleading as tank is square
- Occasional shipping damage
The Jobox Crescent is built for contractors and fleet operators who need a tank that survives years of hard use without complaint. The heavy-duty alloy steel construction is noticeably more robust than budget options, and the square design maximizes fuel capacity for the footprint. I have seen these tanks on construction sites that are still going strong after five-plus years of daily use. The alloy steel takes hits that would crack thinner tanks and keeps performing without issues.
The internal baffles serve double duty: they control fuel slosh during transport and add structural rigidity to the tank walls. Combined with reinforced 2-inch NPT bungs that allow pump mounting on either side, this tank offers genuine versatility in how you configure your fuel transfer setup. Built-in lifting rings are a practical feature that not every manufacturer includes. Moving an empty 85-pound steel tank is manageable with two people, but the lifting rings make the process much safer and more controlled.
Seam Seepage Reports
A small number of reviewers report fuel seeping at welded seams. This appears to be a quality control issue on individual units rather than a design flaw. Inspect your tank thoroughly on first fill and contact Jobox immediately if you notice any seepage.
Pump Configuration Flexibility
The dual 2-inch NPT bungs let you mount your pump on whichever side works best for your truck layout. This flexibility is rare in transfer tanks and makes installation much more adaptable to different bed configurations and user preferences.
How to Choose the Best Fuel Transfer Tank for Your Truck
Transfer Tank vs Auxiliary Tank: What Is the Difference?
A transfer tank stores fuel independently and uses a pump to dispense fuel into other vehicles or equipment. An auxiliary tank connects directly to your truck fuel system and feeds fuel to your engine automatically as you drive. Transfer tanks are more versatile and do not require permanent vehicle modification. Auxiliary tanks extend your driving range but require professional installation and plumbing into your fuel system.
Aluminum vs Steel: Which Material Is Better?
Aluminum tanks will never rust, weigh significantly less than steel equivalents, and maintain their appearance for decades. Steel tanks cost less, resist dents better, and are easier to weld for repairs. For most truck owners, aluminum is the better long-term investment because the weight savings improve fuel economy and the rust resistance eliminates maintenance headaches.
Choosing the Right Capacity
Match your tank capacity to your actual fuel needs rather than buying the biggest tank you can fit. A 36-gallon tank works well for occasional refueling and leaves bed space available. Tanks in the 60 to 80-gallon range suit daily job site use. Anything over 80 gallons is best for fleet operations or long-distance travel where fuel stops are scarce.
Pump Selection and Flow Rates
Pump flow rate determines how fast you can transfer fuel. A 10 GPM pump fills a 5-gallon container in 30 seconds, while a 15 GPM pump does it in 20 seconds. For detailed information on selecting the right pump for your needs, check our guide to the best fuel transfer pumps for farms.
Safety and DOT Compliance
Any transfer tank used on public roads should meet DOT specifications. Look for pressure-tested construction, proper venting systems, and rollover protection. If you also need reliable backup power for your operations, our guide to the best tri-fuel generators for emergencies covers options that work with the same diesel and gasoline you store in your transfer tank. For connecting generators to your home electrical system, see our guide to the best transfer switches for home generators.
Frequently Asked Questions
What is the best fuel transfer tank for trucks?
The RDS 45 Gallon Aluminum Transfer Tank (Model 71083) is the best overall choice for most truck owners. It combines rust-proof aluminum construction, fully welded seams, and a 45-gallon capacity that balances fuel storage with available bed space. For buyers on a budget, the VEVOR 58 Gallon Portable Tank offers excellent value with an included pump and high flow rate.
Is it safe to put gasoline in a transfer tank?
Gasoline can be stored in transfer tanks that are specifically rated and approved for gasoline use. Not all transfer tanks are gasoline-compatible, so always verify fuel type ratings before purchasing. Tanks designed for diesel-only use lack the vapor management systems required for gasoline storage and should never be used with gasoline.
What is the difference between a diesel transfer tank and a gasoline transfer tank?
Diesel transfer tanks are designed for the lower vapor pressure of diesel fuel and may lack the vapor recovery systems required for gasoline. Gasoline transfer tanks include additional venting, pressure relief valves, and spark-resistant components to manage gasoline’s higher volatility. Using a diesel-only tank for gasoline creates serious safety risks and may violate regulations.
What gauge steel is best for fuel transfer tanks?
For steel transfer tanks, 14-gauge steel provides the best balance of durability and weight. Thicker 12-gauge steel offers maximum impact resistance but adds significant weight. Tanks lighter than 14-gauge are more prone to denting and may not meet DOT specifications for highway use.
Do I need DOT approval for a transfer tank?
DOT approval is required for any fuel transfer tank transported on public roads. DOT-approved tanks meet specific standards for construction, venting, pressure testing, and rollover protection. Non-DOT tanks may be used on private property or job sites only and cannot legally be transported on highways filled with fuel.
Final Verdict: Which Fuel Transfer Tank Should You Buy?
After testing and reviewing all ten tanks on this list, the RDS 45 Gallon Aluminum Transfer Tank remains my top recommendation for the best fuel transfer tanks for trucks in 2026. Its combination of rust-proof aluminum construction, perfect size for most applications, and proven reliability makes it the right choice for the majority of truck owners. If budget is your primary concern, the VEVOR 58 Gallon Portable Tank delivers exceptional value with its included pump and high flow rate. For those who need maximum capacity, the RDS 91 Gallon or Dee Zee 106 Gallon tanks provide the fuel reserves needed for the longest trips and most demanding operations. Whichever tank you choose, make sure it meets DOT approval for your intended use and matches your truck bed dimensions before ordering.