Lippert Suspension Parts: A Complete Guide to Selection and Maintenance

Lippert Components is one of the most recognized names in the RV and trailer industry, supplying suspension systems that balance load capacity, ride comfort, and durability. Whether you own a travel trailer, a fifth wheel, or a towable toy hauler, understanding Lippert suspension parts can help you maintain your vehicle's handling and prolong the life of your tires, frame, and cargo. This guide covers the most common Lippert suspension components, how they work together, what to consider when replacing or upgrading parts, and essential maintenance practices.

Understanding Lippert Suspension Systems

Lippert’s suspension designs vary by application, but most fall into a few broad categories: leaf spring systems, torsion axles, and independent suspension. Leaf spring systems are the most traditional and are found on many entry-level and mid-range trailers. Torsion axles use a rubber-cord system inside the axle beam to absorb road shock, which is common on lighter RVs and certain utility trailers. Independent suspension (such as the Lippert Ground Control system) provides each wheel its own travel path, improving stability and comfort on uneven terrain.

Key Components of a Leaf Spring System

• Axles: Lippert offers standard tube axles in various capacities (e.g., 3,500 lb, 5,000 lb, 6,000 lb) with either drop or straight configurations. Axle beam material and wall thickness affect strength and weight.
• Leaf Springs: These are the primary support elements. Lippert springs come in different lengths, arch heights, and number of leaves. Common options include single-leaf, two-leaf, and multi-leaf packs. The spring rate (pounds per inch of deflection) determines ride firmness and load capacity.
• Equalizers: On tandem-axle trailers, an equalizer connects the two leaf springs between the axles. It allows the suspension to articulate and distribute loads more evenly across both axles.
• Shackles and Brackets: These small but critical parts connect the leaf springs to the trailer frame or equalizer. Lippert supplies standard brass-bushed or greasable shackles, along with hanger brackets and U-bolts.
• Wet Bolts: Some Lippert suspension kits include wet bolts with grease zerk fittings, reducing friction and wear at pivot points.

Torsion Axle Systems

Lippert’s torsion axles use a steel bar inside a rubber cord sleeve. As the wheel moves up, the rubber twists, providing both spring action and damping. There are no leaf springs, shackles, or equalizers. Key parts include the axle beam, spindle, and rubber cord cartridge. Torsion axles are typically maintenance-free but must be replaced as a unit if the rubber degrades or the bearings fail.

Independent Suspension (Lippert Ground Control)

Ground Control is a four-point independent suspension system with shock absorbers. It uses air springs instead of leaf springs for adjustable ride height and load leveling. Components include air bags, shock absorbers, linkage arms, and mounting brackets. This system is found on high-end motorhomes but also on some towable RVs.

How to Choose the Right Lippert Suspension Parts

Selecting the correct parts hinges on your trailer’s gross vehicle weight rating (GVWR), axle load, and intended use. Follow these steps:

1. Determine the GVWR and Axle Capacity: Check the trailer’s certification tag (usually near the tongue or on the driver-side frame). The axle(s) must support the weight, factoring the trailer’s empty weight plus cargo. Choose axles and springs rated at or above the GVWR. For tandem axles, divide GVWR by two to get individual axle requirements.

2. Match the Leaf Spring Configuration: Single-leaf springs are lighter and softer but may sag under heavy loads. Multi-leaf packs offer higher capacity and more resistance to sway. For heavy trailers, opt for a spring pack with multiple leaves and a higher spring rate.

3. Consider Ride Height: The trailer must sit level when hitched. Measure the current ground-to-frame distance at the axle center. Your replacement springs or torsion axle should maintain that height or be adjustable (e.g., via lift blocks). Lippert springs are available in different free arch heights; consult a cross-reference chart or a dealer.

4. Upgrade to Wet Bolts: If your trailer uses dry (non-greased) bolts, upgrading to wet bolts with zinc or stainless steel construction can extend component life and reduce maintenance. Greasable bolts allow you to lubricate the pivot points without disassembly.

5. Inspect the Hangers and Brackets: Over time, hangers can bend or crack. Replace any worn or damaged hangers with Lippert’s OEM or heavy-duty options. Hangers come in different widths; measure the spring eye width (typically 1-3/4 inches) to ensure a proper fit.

6. Check the Shackle Length: Shackle length affects axle travel and ride stability. Stock shackles are usually around 4 inches eye-to-eye. Longer shackles (e.g., 5 or 6 inches) can soften the ride but may allow excessive axle movement, risking tire contact with the wheel well. Stick with the manufacturer’s recommended length unless you know what you’re doing.

7. Decide Between Standard and Heavy-Duty: Heavy-duty leaf springs use thicker steel and are often designed for off-road or high-use applications. If you frequently drive on rough roads, consider upgrading to a heavy-duty pack with anti-sway properties (e.g., with a friction pad between leaves).

Installation and Maintenance Tips

Replacing or upgrading suspension parts can be a DIY job, but safety is paramount. Always support the trailer on level ground with jack stands under the frame, not under the axles. Never crawl under a trailer supported only by a hitch jack or tongue jack.

• Torque Specifications: Each bolt has a recommended torque setting. For U-bolts, typical torque ranges from 45 to 90 ft-lbs depending on diameter. Over-torquing can break the bolt or crush the spring eye. Under-torquing leads to looseness and wear. Use a torque wrench and tighten in a cross pattern if multiple bolts are used.
• Alignment: After replacing leaf springs, check the axle alignment. The axles should be perpendicular to the trailer frame and parallel to each other. Misalignment causes tire cupping and handling issues. Lippert axles come pre-aligned from the factory, but after spring installation, use a trammel gauge or string line to verify.
• Greasing: If you install wet bolts, inject grease (use a high-quality lithium-based or synthetic grease) until fresh grease oozes from the joints. Do this every 3,000 miles or annually. Grease the wheel bearings at the same interval.
• Inspecting Torsion Axles: For torsion axles, check the rubber for cracking, especially around the beam ends. If the rubber is dry or crumbling, the axle needs replacement. Also, check the bearing hubs annually.
• Fastener Service: Rusted or seized bolts are common. Use penetrating oil before attempting removal. Replace any bolts that are stretched, bent, or have damaged threads.

Common Issues and Solutions

• Uneven Tire Wear: This often indicates axle misalignment, weak springs (causing sag), or worn shackles. Replace sagged springs and check alignment.
• Excessive Sway: Weakened leaf springs, loose U-bolts, or incorrect equalizer settings. Tighten all fasteners and consider upgrading to a center bolt or adding a sway control bar.
• Noise: Clunking from the suspension usually stems from dry shackle bolts or worn bushings. Lubricate wet bolts or replace dry bolts with greaseable ones.
• Bottoming Out: The suspension hits its travel limit. This can be due to overloading, weak springs, or incorrect ride height. Check load distribution and consider adding helper springs or air bags.

Final Recommendation

For most RV owners, replacing worn leaf springs with Lippert heavy-duty multi-leaf springs and upgrading to wet bolts offers the best balance of improved ride quality, lower maintenance, and long-term reliability. If you’re building a custom trailer or upgrading for better off-road capability, the Ground Control independent suspension is a solid (though more expensive) option. Always consult the Lippert Cross-Reference Guide or a trusted dealer to confirm part numbers. Keep a log of your trailer’s GVWR and any modifications to ensure you stay within safe limits. Regular inspection—at least once per year or before any big trip—will catch small problems before they become expensive repairs.