2021 Grand Design Momentum Body and structure Problems
- Complaints
- 42about this part
- Share
- 72%of 58 total for the year
- Median mileage
- 8,000miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 42 complaints about the body and structure of the 2021 Grand Design Momentum, 72% of the 58 complaints for this model year. Where a mileage was given, the median is 8,000 miles.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“This trailer has frame flex in the gooseneck area to the point it is damaging the cabinetry in the front of the trailer. I have been in multiple momentum trailers with this problem and the dealership just wants me to trade it in or charge an astronomical amount of money to try and fix. It’s a known problem that everyone needs to be aware of.”
NHTSA complaint #11556669, filed 2023-11“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. …”
NHTSA complaint #11584593, filed 2024-04“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.”
NHTSA complaint #11588931, filed 2024-05“Frame failure! Driving down the road and noticed the kin box moving up and down into the Rv! I do not feel comfortable towing this Rv I feel it is going to cause a serious accident.”
NHTSA complaint #11616633, filed 2024-09“Our 2021 Grand Design 395ms has FRAME FAILURE. The upper body of the frame has multiple broken welds and has separated during road use. If the welds continue to fail I have been told the lower half of the 5th wheel will fall to the pavement. If this were to occur during travel it could be catastrophic. This issue was iniitally repaired in thermopolis by a mobile welder. This initial repair failed and we had to contact the manufacturer. They initially told us it would be a couple months before their SRT team could repair. …”
NHTSA complaint #11613696, filed 2024-09Related service bulletins
- 11026622Nov 22, 2025Grand Design is addressing concerns of excessive frame flex or wall securement in the front upper deck area of a limited number of fifth-wheel units. This condition could…
- 10253005Apr 10, 2024TSB 24-001 Issued in March on March 7th. Concern: Complaint of upper deck flex which results in cosmetic damages to the interior and excessive flex at the pin box. Remedy : The…
Body and structure: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2024 | 3 | 27% |
| 2023 | 20 | 80% |
| 2022 | 28 | 85% |
| 2021 | 42 | 72% |
| 2020 | 19 | 66% |
| 2019 | 9 | 60% |
| 2018 | 6 | 86% |
| 2017 | 3 | 23% |
| 2016 | 5 | 50% |
| 2015 | 5 | 100% |
Other parts of the 2021 Grand Design Momentum
27 complaintsSuspension
19 complaintsLatches, locks and linkages
9 complaintsEquipment
3 complaintsBrakes
2 complaintsElectrical system
1 complaintsExterior lighting
1 complaintsTransmission and drivetrain
1 complaints
← All problems reported for the 2021 Grand Design Momentum
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology