2021 Grand Design Momentum

The contact owns a 2021 Grand Design Momentum RV. The contact stated while the RV was parked and occupied, or while driving the RV, there was an abnormal popping and creaking sound coming from the frame of the RV while depressing accelerator pedal or depressing the brake pedal. Neither a dealer nor an independent mechanic was contacted. The contact stated that while driving the RV at an undisclosed speed, the doors opened independently. Additionally, while walking inside the RV, there was an abnormal sound coming from the floorboards. The contact also stated that the frame of the RV was full of rust. The vehicle was not taken to a dealer or independent mechanic to be diagnosed or repaired. The manufacturer was not notified of the failures. The failure mileage was 6,000.

The contact owns a 2021 Grand Design Momentum RV. The contact stated that the RV had experienced a failure with the frame, causing the RV to become unstable while being hauled. Additionally, the frame was positioned on the pin box inside the unit, and the lag bolts and screws loosened, causing damage to the interior cabinets and trim. The RV was taken to the local dealer, who replaced the bolts and screws, but later, while using the RV, the failures reoccurred. The RV was not yet repaired. The manufacturer was notified of the failure. The failure mileage was unknown.

The contact owns a 2021 Grand Design Momentum. The contact stated that while the trailer was parked, the contact became aware that the axle on the trailer had become inoperable. The contact stated that the axle springs had detached, and the I-beam frame of the trailer was bent. The trailer was taken to an independent mechanic, where it was diagnosed and determined that the axle springs and the frame had failed and needed to be replaced. The trailer was not repaired. The dealer was contacted; however, the trailer was not diagnosed or repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 8,000.

I am experiencing symptoms, consistent with excessive frame movement and structural failure in my 42 foot fifth wheel toy hauler RV. We have been monitoring this for the time we have owned it just over six weeks and have noticed an increase and symptoms that research shows indicate there is a problem.. we are seeking professional inspection and guidance to establish the scope of it and hopefully catching it at the earlier side in order to hopefully deal with the issue easier than after a total failure. The symptoms include 1- the interior upper section horizontal lag bolts that hold the camper walls to the frame all had come loose completely. There were four on one side and five on the other. 2- the underside curved fillon panel by the pin box is ripple and curved, and shows movement 3- the left and right sides of the camper towards the front are becoming out of square with the rest of the camper and the seals around the doors are showing larger gaps and looking more out of square 4- interior doors and exterior doors of the camper are all experiencing difficulty latching and are becoming out of square to the original structure 5- there is a changing of the distance, measurements both in height, and in relation to the lower frame members from the pin box where the camper tows from. And what appears to be some twisting out of square. 6- front panel door is buckling in the center and will no longer close geometry of the opening has been compromised It is clear that we are experiencing frame structural failure between the area where the camper toast from in relation to the main frame of the camper

We purchased our 2021 Grand Design 395M Momentum new in early 2021. Over the past year we noticed cabinets on the passenger side bedroom separating from there wood frames. We initially repaired the cabinets ourselves thinking it was just poor workmanship. This last trip from Houston to Myrtle Beach the cabinets again separated. Someone in the campground at Myrtle Beach informed us about the issue with Grand Design's frames. Upon closer inspection I noticed that the bottom of the cap had separated approximately 1" and when you lower the unit onto the 5th wheel hitch the pin box sinks an additional 1.5". It appeared sever enough that we were uncomfortable towing the unit back to Houston. We secured an enclosed trailer (at our expense) for our items and left the unit in storage (at our expense) until we could contact Grand Design. We contacted Grand Design and are scheduling our unit to be towed to a local Myrtle Beach dealer for repair. In my opinion if we would have attempted to tow the trailer it could have broken loose and collapsed on to our truck or broke free entirely. At a minimum I do believe a letter notifying owners of the issues is warranted and what repairs/changes are being made. It is only a matter of time before there is a catastrophic event with sever injury or death.

We took possession of our new 2021 Grand Design 381M fifth-wheel travel trailer in April 2021. During 2021 and 2022, the trailer saw minimal road use. However, during our travels, we observed significant movement within the trailer, and on several occasions, the cargo bay doors opened while in transit. In August, we contacted Grand Design due to visible interior damage and abnormal movement. They arranged to pick up the trailer and transport it to their facility for inspection and repair. Grand Design confirmed that the trailer had suffered a frame failure. They reportedly completed the necessary repairs and returned the trailer to us. Unfortunately, not all issues were resolved. In May 2023, the trailer was returned to the facility for additional repairs. Afterward, it was returned to us once again. In August 2024, signs of frame failure reappeared. We contacted Grand Design, and a mobile technician was dispatched to inspect the trailer. The technician confirmed another instance of frame failure. Due to seasonal considerations, we arranged for the trailer to be transported back to Grand Design in March 2025. Repairs were made, and the trailer was returned later that month. We remain deeply concerned about the adequacy and durability of the repairs, and whether the trailer is truly roadworthy and safe. Despite multiple requests, Grand Design has not provided any photos of the frame damage or documentation of the repairs performed. This lack of transparency is especially troubling given the recurring nature of the issue and the broader concerns surrounding frame integrity across multiple Grand Design models. We are left with the impression that the structural integrity of our trailer—and potentially others—has been compromised. We believe this poses a serious safety risk for anyone traveling on U.S. roadways.

Excessive frame flexing/failure in the upper deck of our 5th wheel.discovered damage is 1. Sawdust on furniture in the bedroom and by entry door from living area to the garage at intersection of wall and floor. 2. Furniture rub marks on wall in bedroom from upper cabinets with driver side having bowed out base or molding where it sits on window valance. 3. Separation of night stands from wall in bedroom on both sides and a curved wall in front.  4. Squeaky floor in bedroom on drivers side between bed and closet 5. Wrinkles and separation from steps and wall in the upper deck 6. Wrinkles around frame of hallway window in upper deck 7. Exterior of RV underneath the nose along where pin box is located there is separation with screws coming loose/out. The outside cap moldings loose and flapping in the breeze while going down the road 8. Lag bolts in the front section of 5th wheel that hold the wall to the frame some were missing, some coming loose, and all were undersized. These issues can contribute to further frame cracking and king pin failure that may result in significant property damage or even death, putting our family and others on our highways at risk. Grand Design sent a service repair technician (SRT) to inspect. During inspection a crack in the frame was found and told that welding would be needed. Appointment made at authorized repair facility and now the needed repair is being denied due to the pin box movement is at their minimum tolerance, yet the frame failure still exists causing a safety concern. Grand Design is aware of frame failure in several models and has yet to issue a recall of the structural defects caused by under sizing the frames and using the wrong lag bolts, and denying the repairs that are covered under their extended 5 year frame warranty.

I am experiencing upper deck frame flex which our manufacturer has unsuccessfully attempted to repair twice (Nov 2021 and Oct 2024). The manufacturer refuses to accept responsibility for our safety concerns and has ceased all remaining repair attempts which was communicated to us through emails. This excessive flex causes my cargo doors to open while traveling, damage to the supporting frame structures (frame cracks throughout), and the attaching king pin that no longer supports the weight of our RV as evidenced by the 1 inch drop when hooking our RV up to the tow vehicle. Multiple repair attempts have been made by the manufacture at the manufacturer's facilities however, each attempt has failed and is simply weakening the already weakened frame. The manufacturer has extended the warranty to its consumer base however, my contention is this is merely "optics" given their refusal to apply a "permanent" fix to our RV that IS currently under their extended warranty.