7 Best Air Tank Mounting Brackets For Rv Undercarriages

Finding space for onboard air systems in an RV often leads directly to the undercarriage, where unused frame real estate offers the perfect home for a heavy air tank. However, suspension movement, road vibration, and constant debris mean that choosing the wrong mounting bracket can turn a valuable utility into a dangerous road hazard. Selecting the right bracket ensures your system remains rock-solid, functional, and safe over thousands of miles of rough highway.

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Viair 91014 Mounting Bracket: Best for 2.0 Gallon Tanks

The Viair 91014 Mounting Bracket is built specifically to cradle 2.0-gallon air tanks with precision. The design wraps around the tank body to distribute weight evenly across the mounting footprint. This prevents the pinpoint stress fractures that often occur with universal, flat-plate brackets under constant road vibration.

Made from heavy-gauge steel with a corrosion-resistant coating, this bracket is engineered for harsh underbody environments. Because 2.0-gallon tanks are the sweet spot for air suspension helper bags and tire inflation, this bracket is optimized for standard RV chassis rails. However, its exact fit means it offers zero flexibility if you decide to upgrade to a larger tank size later.

If you are running a standard 2.0-gallon tank setup and want a secure, tailormade fit without fabricating custom tabs, this is your best option. It eliminates the guesswork and holds the tank tight against the frame rail. Avoid this choice if you anticipate needing more air capacity down the road, as you will have to replace the entire mounting system.

HornBlasters Universal Bracket: Best for Easy Bolt-On

HornBlasters Stealth Spare Tire Delete Bracket Universal Horn Mount for Full-Size Trucks & SUVs Out-of-Sight Installation Weather-Resistant Steel Bracket Quick & Easy Install

The HornBlasters Universal Bracket targets the common headache of drilling into hardened RV chassis frames. It features a smart, pre-slotted hole pattern that aligns with existing factory frame holes across multiple vehicle makes. This layout minimizes the need for specialized tools during installation, saving time and preserving structural frame integrity.

While “universal” often implies compromises, this bracket maintains impressive rigidity through thick-plate steel construction. The black powder-coat finish guards against road salt and moisture splash. The tradeoff is that the universal slots can sometimes require thick, heavy washers to bridge gaps, which must be checked periodically for shifting.

For RV owners who dread the thought of drilling steel or who lease their chassis and need a reversible installation, this bracket is a lifesaver. It fits a wide range of tank diameters, making it highly versatile. If you prefer a highly customized, ultra-low-profile fit, a dedicated vehicle-specific mount might serve you better, but for general ease of installation, this is the benchmark.

Kleinn MT200 Dual Tank Bracket: Best Heavy-Duty Option

Heavy-duty air demands, such as running high-decibel train horns or power tools, require more volume than a single small tank can provide. The Kleinn MT200 Dual Tank Bracket is engineered to hold two tanks simultaneously, maximizing your storage capacity without eating up twice the frame length. This side-by-side configuration optimizes tight undercarriage clearances.

Constructed from high-strength steel, this bracket is built to withstand extreme mechanical stress. When carrying the weight of two filled steel air tanks, inferior brackets can flex, leading to metal fatigue or loose fasteners. The MT200 utilizes reinforced gussets to eliminate this flex entirely, ensuring both tanks remain locked in place even on corrugated gravel roads.

Keep in mind that this level of heavy-duty engineering adds noticeable weight to your rig before the tanks are even mounted. The bracket is bulky and requires a clear, flat section of frame rail to mount properly.

This is the absolute right choice for the off-grid RVer or toy-hauler owner who needs maximum air volume for tools and rapid tire reinflation. It is overkill for simple air-spring maintenance, but if dual-tank reliability is your goal, nothing else compares.

Pacbrake HP10013 Bracket: Best for Frame Rail Mounting

Frame rail mounting is the gold standard for undercarriage safety because it keeps heavy accessories close to the vehicle’s structural center of gravity. The Pacbrake HP10013 is designed specifically to hug the vertical face of standard C-channel frame rails. This keeps the air tank tucked up high, out of the way of road obstacles and ground clearance hazards.

This bracket features a clever design that uses clamp-style brackets to grip the frame, often eliminating the need to drill into the frame flange. It provides a highly stable platform that resists twisting forces during vehicle body roll. The tradeoff is clearance: you must ensure your brake lines, wiring harnesses, and fuel lines on the back of the frame rail are carefully routed around the mounting clamps.

This bracket is ideal for mid-sized RVs and camper vans where ground clearance is at a premium and every inch of underbody space is contested. It provides a secure, tucked-away mounting solution that protects your tank from bottoming out. If your frame rail is already cluttered with factory lines, you may find the clamping mechanism difficult to position without significant relocation work.

Firestone 2539 Frame Bracket: Best No-Drill Solution

Drilling into a modern RV chassis can void manufacturer warranties and weaken the tempered steel of the frame. The Firestone 2539 Frame Bracket bypasses this risk entirely by using a heavy-duty clamp system that wraps around the frame rail. This sandwich-style mounting method uses high-tensile bolts to squeeze the bracket securely to the steel.

Firestone engineered this bracket specifically for helper spring systems, meaning it is built to survive under heavy tow rigs. The thick steel construction is zinc-plated to resist corrosion from road spray. Because it clamps on, adjusting the tank’s position forward or backward along the frame during installation is incredibly easy compared to drilled brackets.

The main limitation is frame compatibility, as the clamp is sized for standard light-to-medium-duty truck and RV frame heights. Ensure your specific frame dimensions match the clamp capacity before buying.

If preserving your frame’s structural integrity and keeping your vehicle warranty intact are top priorities, buy the Firestone 2539. It is a premium, highly secure solution that makes installation accessible to anyone with basic hand tools.

Air Lift 50714 Spacer Kit: Best for Custom Clearance

Standard mounting brackets often hold the air tank too close to the frame, leaving no room for existing bolts, wiring, or brake lines. The Air Lift 50714 Spacer Kit solves this problem by providing the necessary offset to clear these obstacles. By spacing the bracket away from the frame, it turns an impossible installation location into a functional one.

This kit is made of durable, corrosion-resistant components designed to handle the shear forces of a heavy tank bouncing on rough roads. It includes high-grade hardware to ensure the extended leverage doesn’t compromise mounting strength. However, spacing a heavy tank further from the frame does increase the rotational torque on the mounting bolts, which requires precise torquing.

This kit is not a standalone bracket, but rather an essential modular helper for complex undercarriages. It is perfect for DIY builders tackling custom conversions or crowded Class C motorhome frames. If you have a wide-open, clean frame rail, you can skip this extra expense, but for tight, crowded spaces, it is an indispensable problem solver.

Vixen Air VXT2000B Steel Bracket: Best Budget Choice

Equipping an RV with onboard air can quickly become expensive, making budget-friendly mounting options highly attractive. The Vixen Air VXT2000B Steel Bracket delivers reliable support without the premium price tag. It uses a straightforward, functional design that securely cradles standard-sized tanks up to 2.0 gallons.

Despite the low price, this bracket is constructed from solid steel and finished with a durable black powder coat. It features pre-drilled holes that simplify alignment during installation. The trade-off for the lower cost is a slightly thinner gauge of steel than its premium competitors, which may flex more under extreme off-road conditions.

For typical highway RVers who want to mount a small tank for occasional tire inflating and air-ride adjustments, this bracket is a smart, economical choice. It gets the job done safely without draining your build budget. If you plan to drive extensively on washboard dirt roads or carry oversized tanks, investing in a heavier-duty bracket is wiser.

Finding the Safest Undercarriage Location on Your RV

Locating the right spot under your RV for a heavy, pressurized air tank requires balancing safety, accessibility, and weight distribution. The ideal spot is high up along the main chassis frame rails, positioned between the front and rear axles. This zone protects the tank from being struck during steep transitions, such as entering gas stations or climbing driveways.

Avoid placing the tank directly behind the rear axle or near the bumper. This rear overhang area is highly vulnerable to “bottoming out” and dragging on the pavement. Additionally, stay clear of the exhaust system, as constant heat cycles can fatigue the metal tank and pressure lines over time.

When evaluating potential spots, consider the following key factors:

• Proximity to the compressor: Keep air lines short to minimize pressure drops and potential leak points.
• Service access: Ensure you can easily reach the tank’s bottom drain valve to clear moisture.
• Ground clearance: The tank and bracket should never hang lower than the lowest point of the adjacent frame or axle.

How to Protect Your Mounted Air Tank From Road Debris

Undercarriage components live in a brutal environment, constantly bombarded by gravel, road grime, water, and salt. An unprotected air tank can quickly suffer from chipped paint, leading to rust and dangerous structural weakening of the pressure vessel. Protecting your investment requires taking active defensive measures during installation.

A highly effective shield can be created by installing a simple mud flap or a custom metal debris guard ahead of the tank assembly. This deflector blocks high-speed rocks thrown up by the front tires. Additionally, wrapping the tank in a heavy-duty vinyl cover or applying a thick layer of rubberized undercoating can cushion impacts and prevent stone chips.

Pay close attention to the fittings and air lines, which are more fragile than the tank itself. Use split-loom tubing or braided stainless steel sleeving to protect the air lines from abrasion. Ensure all electrical connections for pressure switches are sealed with heat-shrink tubing and dielectric grease to prevent water intrusion.

Routine Maintenance Tips for Undercarriage Mounts

Undercarriage air systems are easily forgotten until a failure occurs, but regular inspections prevent minor issues from becoming catastrophic road hazards. Vibration from highway driving can slowly back out mounting bolts, even those with lock washers. A quick physical check of bolt torque should be included in every pre-trip inspection list.

Moisture is the natural enemy of any air system, causing internal tank rust and external bracket corrosion. You must drain the water from your tank regularly using the petcock valve, ideally after every major trip. At the same time, inspect the bracket welds and powder coating for chips or hairline cracks that signal metal fatigue.

Apply a rust-inhibitor spray to the bracket and mounting hardware at least once a season, especially if traveling in coastal areas or winter climates. Keep the rubber isolators, if your bracket uses them, free of oil and road grime to prevent dry rotting. Taking these proactive steps ensures your onboard air system remains safe and operational for years to come.

Investing in a high-quality air tank mounting bracket is a small but critical step in building a reliable RV onboard air system. By prioritizing secure mounting locations, robust debris protection, and consistent maintenance, you safeguard your equipment and your safety on the open road. Choose the bracket that aligns best with your specific chassis requirements and enjoy the peace of mind that comes with durable, rugged construction.