2021 Grand Design Momentum

Side compartments opening while towing unit on highway…items in compartment flying out …hatches won’t closed properly to much gap…big gap also on top cap where it connects to wall in front..unit taken to lazdays Tampa for frame flex recall…inspection revealed major cracks in frame everywhere as a result causing major frame flex…lots of welding is being done…by grand design mechanic ..slide system also damaged as a result of frame flex …unit is currently still at lazdays Tampa being welded together…they keep finding more and more damage …. You guys should send an inspector to inspect it to see major frame damage from poor frame build I believe unit is unsafe to be roadworthy with the amount of welding and repairs to frame the keep doing

The frame and suspension on our 2021 Grand Design is failing. The frame on the upper deck has broken welds and there is visible movement in the upper deck when hitching and unhitching. The furniture inside the main bedroom move when hitching and unhitching. The side walls have started to detach from the frame as evidenced by screws backing out or breaking. The suspension has bent components. The frame is also bending in the right front. The hitch visibly moves into the upper deck when hitching.

I had noticed the Pin Box flexing, especially over bumps or any rough road or bridge approach. As it got worse I could tell we a lot of flex in the frame area where the Pin Box is located. I contacted the dealer and they examined our RV and determined the frame was flexing due to the bolts connecting the chassis to the actual frame of the RV body being to small and working loose/broke. The dealer replaced the bolts with larger bolts and advised the flex is now within specifications. It is better but it's not great by any means. I'm concerned as the RV gets older the condition will get worse and could even become hazardous. This condition has already affected the value of the RV and when it's out of warranty I'll have no recourse other than to fix it myself.

There was excessive frame Flexing in the nose section of our 5th wheel. I inspected the lag bolts in the front section of our 5th wheel that hold the wall to the frame and found 4 bolts missing of the 12 that are supposed to be installed. Also, the bolts that were installed were undersized. I also have damage to the inside wall and cabinets from over-flexing during travel. I have not contacted a dealer of the manufacturer but have been following many other individuals on forums who have had similar issues. I have not had my unit inspected yet, but plan to start the process with Grand Design. The warnings were trim pieces falling off after travel days and damage to the interior wall. I also replaced screws on the outside cap that loosened, and some fell out.

Our 5th wheel RV has had frame flex (frame failure) 4 separate times. The manufacturer has "fixed" it 3 times unsuccessfully. We have just owned this for 3 years and due to the length of time in between reporting to the manufacturer and waiting for repairs, the RV has been broken more than not during ownership. The pinbox is currently flexing due to broken welds on the frame and causes interior and exterior damage to the unit each time it is towed.

In february 2023 we noticed several internal (sawdust, exposed finish nails, floor noises, broken trim, pinched wall coverings) and external (multiple locked doors opening in transit)signs that our RV frame was experiencing excessive flexing, more than what is expected and necessary for a nearly 42' metal vehicle frame. The frame has since failed, the suspension is underrated for the weight of the vehicle. The manufacturers UVW and GVWR sticker knowingly contained incorrect OEM information with proof from a CAT scale leading to me as the owner believing the vehicle could have been loaded with more OEM item weight from the manufacturer than what was accounted for and annotated. Despite understanding the allowable weights and keeping this RV well under the advertised GVWR, the 6 separate leafsprings of the suspension are all flattened. The upper deck frame failed under normal on-road (and very little) use. A 2024 TSB was issued on my RV for "upper deck flex". .5" of movement at the pin box was the "within limits" passing grade. My unloaded and empty RV's measurement taken by an authorized service center by the manufacturer in keeping with the TSB, measured 1.5" of flex at the pin box. This failure was so great it led to the manufacturer instructing the Service center to not move it or release it to me out of safety concerns. It has been at the service center since 4/10/2024 ti present without any instruction or communication from the manufacturer on how to proceed either under warranty or otherwise.