Frame Flex: Chassis Problem in the Grand Design Momentum & Solitude 5th Wheels

Grand Design RVs, particularly the Momentum and Solitude models, have been reported to experience frame flex, a structural issue where the frame of the RV bends or distorts, especially under heavy loads or rough road conditions. Many of these models use Lippert chassis, which some owners allege are under-engineered to support the weight and stresses of these large fifth wheels.

At RV Auto Legal Team, we help RV owners navigate legal options when dealing with significant structural defects. Such issues can compromise the RV’s overall integrity and safety, potentially leading to costly repairs and a decrease in resale value for owners.

What is Frame Flex?

Frame flex happens when the chassis bends or twists during regular use, which can cause:

Many owners of 2022–2024 Grand Design Momentum and Solitude 5th wheels RVs report that the flex is noticeable when towing or leveling the RV. In extreme cases, owners have observed cracks forming above the rear axle or in the side rails.

Grand Design Relies on Lippert Components

Grand Design relies on Lippert components for the chassis of many Momentum and Solitude models. Reports indicate that some Lippert frames may lack sufficient bracing and reinforcement, making them prone to excessive flex under normal conditions.

This flex can affect slide-out operations, potentially causing jamming, uneven leveling, or premature wear of mechanical components. Owners frequently report needing multiple repairs to address symptoms without resolving the underlying structural issue. This has raised questions among RV owners and industry observers about the structural integrity of these RVs when equipped with Lippert frames.

NHTSA Investigation

The NHTSA has been in contact with both Grand Design and Lippert, the frame manufacturer. Grand Design believes that some frame flex, generally considered to be vertical movement in the upper deck area of the fifth wheel, is normal. However, Grand Design has developed a technical service bulletin (TSB) to evaluate concerns of excessive frame flex, defined as vertical movement greater than 3/8 inch.

According to Grand Design, this problem is only occurring in the upper deck area of the fifth wheel and is resulting in cosmetic defects such as moving sidewalls, damage to cabinets, and binding doors. On the other hand, Lippert believes that the effects of frame flex may also extend back to the front axle of the trailer. (NHTSA Investigation PE24029)

Legal Implications

Persistent structural issues in RVs can lead to safety risks and may qualify for lemon law claims if:

• The RV has been repeatedly repaired for the same structural issue.
• The defect substantially impairs use, value, or safety.
• The manufacturer fails to provide timely or effective repairs.

Frame flex, particularly when affecting slide-outs or leveling systems, is a substantial defect that can justify legal action.

Steps to Protect Your Rights

1. Document Everything – Photograph cracks, sagging, or misalignment, and note repair dates.
2. Track Repair Delays – Keep a record of all time your RV is in the shop.
3. Report the Issue – Contact Grand Design RV and reference concerns.
4. Consult a Lemon Law Attorney – Experienced counsel can guide you through claims for buybacks or replacement.