7 Best RV Fuel Tanks For Long Distance Travel

There is nothing quite as frustrating as watching your fuel gauge plummet while navigating remote stretches of highway with a heavy trailer in tow. Extending your range isn’t just about convenience; it is about the peace of mind that comes from knowing you can bypass expensive, crowded stations and reach your destination on your own terms. Investing in an auxiliary fuel tank transforms your long-distance travel experience from a series of stressful pit stops into a seamless journey.

Disclosure: As an Amazon Associate, this site earns from qualifying purchases. Thank you!

Titan Fuel Tanks: Best For Ford Super Duty

If you drive a Ford Super Duty, the Titan Fuel Tank is the gold standard for replacing your factory tank with a high-capacity, mid-ship unit. These tanks are crafted from military-grade, cross-linked polyethylene, which means they are incredibly tough and won’t rust or corrode like steel counterparts. Because they replace the original tank rather than sitting in your truck bed, you maintain your full cargo capacity.

This is the ultimate choice for the traveler who wants a "set it and forget it" solution. You get significantly more range without sacrificing an inch of bed space, which is critical if you are hauling a truck camper or a fifth-wheel hitch. If you are serious about long-range towing and want a clean, factory-integrated look, Titan is the only way to go.

Transfer Flow: Top Choice For Ram Trucks

Transfer Flow has built a reputation on precision engineering, particularly for the Ram platform. Their systems are often designed to integrate seamlessly with the truck’s onboard computer, providing accurate fuel level readings directly on your dashboard. This level of integration is a game-changer, as it eliminates the guesswork associated with aftermarket gauges.

These tanks are typically made from aluminized steel and are powder-coated for exceptional durability. They are perfect for the RVer who values sophisticated technology and wants an auxiliary system that feels like it rolled off the assembly line. If you own a Ram and want a high-end, reliable solution that communicates perfectly with your vehicle, Transfer Flow is the clear winner.

Aero Tank Systems: Custom Steel Solutions

Sometimes, off-the-shelf options simply don’t fit the unique configuration of a custom build or a specific chassis setup. Aero Tank Systems specializes in custom steel fuel tanks that can be fabricated to fit tight spaces where other tanks simply won’t go. Their focus on heavy-duty steel construction ensures that these units can handle the vibration and stress of rugged, off-grid travel.

I recommend Aero Tank for those who have exhausted standard options and need a bespoke solution for a unique rig. Because these are custom-built, you will need to be precise with your measurements and expectations. If you have a non-standard truck bed or a specialized vehicle setup, Aero is your best bet for a high-quality, made-to-measure fuel solution.

RDS Aluminum Tanks: Best For Truck Beds

RDS Aluminum tanks are the go-to for those who want a reliable, lightweight auxiliary tank that sits inside the truck bed. Aluminum is naturally resistant to corrosion, making these tanks a great long-term investment for those who travel in varied climates. They are relatively easy to install and often come in various shapes, including low-profile designs that fit under tonneau covers.

These tanks are ideal for the budget-conscious traveler who wants to add range without a permanent chassis modification. While they do take up some bed space, their ability to gravity-feed into your main tank makes them incredibly simple to operate. If you want a functional, no-nonsense setup that gets the job done without breaking the bank, look at RDS.

Dee Zee Auxiliary Tanks: Top Value Pick

Dee Zee offers a fantastic balance between cost and build quality, making them a staple for many weekend warriors and full-time nomads alike. Their tanks are constructed from heavy-gauge aluminum and are designed to be durable enough for daily use. They are widely available and simple to source, which is a major advantage if you are on a tight timeline for a build.

These tanks are perfect for the traveler who needs an extra 30 to 60 gallons of fuel but doesn’t want to spend a fortune on complex systems. They are straightforward, reliable, and get the job done. If you are looking for a reliable "value" pick that won’t let you down on the open road, Dee Zee is a solid, dependable choice.

Better Built Tanks: Secure Storage Design

Better Built stands out because they often combine fuel storage with integrated toolboxes. This is a brilliant use of space for the RVer who needs to carry essential gear, spare parts, or tools alongside extra fuel. The security features on their locking lids are top-notch, providing peace of mind when you are parked in public areas.

This tank is for the traveler who views their truck bed as a multi-functional space. You aren’t just gaining fuel range; you are gaining a secure, weather-resistant storage solution. If you need to maximize every square inch of your truck bed for both fuel and gear, Better Built is the most efficient choice.

ATTA Fuel Systems: Best For Quick Refuel

ATTA Fuel Systems are designed for those who need to move fuel efficiently, often featuring high-quality transfer pumps and robust plumbing kits. Their systems are known for being user-friendly and reliable, which is crucial when you are miles from the nearest service station. They focus on the "transfer" aspect of the auxiliary tank, ensuring the process is clean and fast.

These systems are perfect for the traveler who needs to refuel their tow vehicle or other equipment quickly and safely. If you prioritize speed and ease of use over all else, ATTA provides a premium experience that makes the refueling process feel effortless. It is a robust system for those who demand professional-grade performance on the road.

Auxiliary Tank Weight Distribution Tips

Adding a large auxiliary tank filled with diesel or gasoline adds significant weight to your truck bed, and you must account for this in your payload calculations. A full 50-gallon tank adds roughly 350 to 400 pounds of weight, which can quickly eat into your truck’s remaining towing capacity. Always position the tank as close to the cab as possible to keep the weight centered over or slightly in front of the rear axle.

Never ignore the impact of a full tank on your vehicle’s center of gravity. If you are also carrying a heavy slide-in camper, ensure that the combined weight of your fuel, gear, and camper doesn’t exceed your truck’s Gross Vehicle Weight Rating (GVWR). Properly distributing this weight is essential for maintaining stable handling and preventing excess wear on your suspension.

Safe Fuel Transfer Pump Installation

Installing a fuel transfer pump requires a meticulous approach to electrical and plumbing safety. Always use fuel-rated hose and fittings, and ensure that all electrical connections are fused and properly grounded to prevent sparks. A leak in a fuel line is not just a mess; it is a major fire hazard that can put your entire rig at risk.

I strongly recommend using a dedicated, weather-proof switch inside the cab to control the pump. This allows you to monitor the fuel transfer process and shut it down immediately if you notice any issues with the flow or pressure. When in doubt, have a professional mechanic verify your installation, especially when dealing with the pressurized lines found in modern fuel systems.

Legal Requirements For Auxiliary Tanks

Before you bolt a tank into your truck, check your local and national regulations regarding auxiliary fuel systems. In many jurisdictions, auxiliary tanks must be DOT-compliant, especially if they are used for commercial purposes or if you are crossing international borders. Some states have specific requirements regarding how the tank is vented and how it connects to the vehicle’s primary fuel system.

Failure to follow these regulations can result in fines or complications during vehicle inspections. Always keep documentation for your tank, including any certifications of compliance, in your glove box. Being prepared and compliant ensures that your long-distance travels remain focused on the road ahead rather than dealing with unnecessary legal headaches.

Equipping your rig with an auxiliary fuel tank is one of the most practical upgrades you can make for long-distance travel. By carefully selecting a tank that fits your specific truck and storage needs, you can significantly reduce your travel stress and gain true independence on the road. Take your time with the installation, respect the added weight, and enjoy the freedom of those extra miles between stops.