If you own a fifth-wheel trailer equipped with a Trailair suspension system, you already know the difference it makes in ride quality. These air-ride systems reduce chucking and bouncing, protecting both your RV and its contents. But like any mechanical system, Trailair components wear out over time. Knowing which parts to look for and when to replace them can save you from costly repairs and keep your rig riding smoothly. This guide covers the essential Trailair 5th suspension parts, how to identify wear, and what to consider when buying replacements.
Understanding Trailair 5th Wheel Suspension
The Trailair suspension is an air-ride system designed for fifth-wheel travel trailers. It uses air springs (airbags) to absorb road shock and dampen movement between the trailer frame and the axle assembly. This system drastically reduces the forward-and-back jerking (chucking) that conventional leaf-spring suspensions can produce. The main components include the airbags, leveling valves, control arms, pivot bushings, and shock absorbers. Each part plays a role in maintaining stability and comfort while towing.
Key Components of the Trailair Suspension
- Air Springs (Airbags): The heart of the system. They support the trailer’s weight and compress/expand to absorb bumps. Over time, rubber degrades, leading to air leaks or loss of ride height.
- Leveling Valve: This valve controls the air pressure in the airbags based on the trailer’s load. It maintains a consistent ride height regardless of weight. A faulty leveling valve can cause sagging or excessive ride height.
- Control Arms and Brackets: These link the axle to the frame and guide the axle’s movement. Worn bushings in the control arms cause play and poor alignment.
- Pivot Bushings: Rubber or polyurethane bushings at the pivot points of the control arms. They wear out from constant flexing, leading to clunks and loose steering feel.
- Shock Absorbers: Some Trailair setups include shocks to control oscillation. Worn shocks reduce damping, allowing the trailer to bounce more.
- Air Lines and Fittings: The rubber hoses that carry air between the valve and airbags can crack or leak, causing the system to lose pressure.
Common Wear Parts and Their Symptoms
The most frequently replaced Trailair 5th suspension parts are the airbags, leveling valves, and pivot bushings. Here’s what to watch for:
- Airbag Leaks: If you hear hissing or notice the trailer sagging on one side after sitting, the airbag may have a pinhole or split. Check for cracks in the rubber.
- Leveling Valve Failure: If the trailer doesn’t return to the same ride height after loading, or if it sits too high or too low, the valve may be stuck or damaged.
- Bushing Wear: A clunking sound when going over bumps or when turning indicates worn pivot bushings. The trailer may also feel loose when towing.
- Shock Deterioration: Oil leaking from shock absorbers or a bouncy ride suggests they need replacement.
Signs You Need Replacement Parts
Don’t wait for a complete failure. Watch for these signs that your Trailair suspension parts need attention:
- Uneven Ride Height: Park on level ground and measure from the frame to the ground on both sides. More than a half-inch difference indicates an air leak or leveling valve issue.
- Excessive Bouncing: If the trailer continues to bounce after hitting a bump, the shocks or airbags may be worn.
- Chucking or Jerking: While not completely eliminated, severe jerking suggests that the pivot bushings are loose or the airbags aren’t maintaining proper pressure.
- Visible Damage: Cracks, dry rot, or bulges on airbags. Rust or bent brackets on control arms.
- Air Loss: If you need to add air more than once a month, there is likely a leak somewhere in the system.
Choosing Replacement Parts for Trailair Suspension
When it’s time to replace Trailair 5th suspension parts, you have options. Here’s how to decide what to buy.
OEM vs Aftermarket
Original Equipment Manufacturer (OEM) parts are made by Trailair or its parent company. They guarantee exact fit and performance. Aftermarket parts are produced by third-party manufacturers. Some aftermarket parts, especially airbags and bushings, can be just as good and often cost less. However, for leveling valves and control arms, stick with OEM to ensure proper function. Aftermarket airbags that meet DOT standards are safe, but always check the load rating and dimensions.
Compatibility
Trailair has produced several suspension models over the years, including the Trailair Air Ride Pin Box, the Trailair Equa-Flex, and the center-point suspension. Not all parts interchange. When shopping, you need to know the model of your suspension and the year and make of your trailer. The serial number on the leveling valve or a label on the frame helps. If in doubt, consult the manufacturer’s website or a knowledgeable dealer. Always measure the mounting centers for airbags and control arm bushings.
Key Specifications to Check
- Airbag Dimensions: Height, diameter, and mounting type (stud or plate). Measure the collapsed height and the distance between mounting holes.
- Leveling Valve Linkage: The length and attachment style of the linkage arm that connects to the axle.
- Bushing Inner and Outer Diameter: Pivot bushings must match the control arm bore and the mounting bolt size.
- Shock Length and Travel: For shocks, measure compressed and extended length, and the mounting style (eyelet or stud).
Maintenance Tips to Extend Lifespan of Trailair Parts
Proper maintenance can double the life of your suspension parts. Simple steps include:
- Keep the system clean: Dirt and road salt accelerate rubber and bushing wear. Rinse the underside after winter trips.
- Check air pressure regularly: Even if you don’t notice issues, inflate the airbags to the recommended pressure every trip. Leaks start small.
- Lubricate pivot points: Use a silicone-based lubricant on bushings to reduce friction and prevent squeaks. Never use petroleum-based grease on rubber parts.
- Inspect before long trips: Look for cracks in airbags, loose bolts on brackets, and signs of rust on valves.
- Store with proper ride height: When parked for long periods, deflate the airbags slightly to take tension off the rubber, but not so much that the suspension bottoms out.
Final Recommendation
Your Trailair suspension is a valuable asset that protects your RV investment. Replacing worn parts promptly maintains ride quality and safety. For critical components like leveling valves and control arms, choose OEM Trailair parts to ensure compatibility. Airbags and bushings can be sourced from reputable aftermarket suppliers as long as they match OEM specs. Always verify your suspension model before ordering, and consider upgrading to polyurethane bushings for longer life. If you are unsure about the condition of your system, a professional RV technician can inspect it and recommend the right Trailair 5th suspension parts. Keeping your suspension in top shape means smoother miles ahead.