2026 Grand Design Momentum M-Class 399M
- Year 2026
- Make Grand Design
- Model Momentum M-Class
2026 Grand Design Momentum M-Class 399M
2026 Grand Design Momentum M-Class 399M
Our top-of-the-line Momentum Fifth Wheel Toy Haulers are — inside and out — our most luxurious Toy Haulers. With the comfort of a master suite and master bath, home’s now a long way from your house.
Features may include:
- Thermal Roof Design (R-40)*
- Fully Laminated Walls (R-11)*
- Triple Insulated Main Floor (R-45)*
- Triple Insulated Garage Floor (R-40)*
- 1.5" Insulated Baggage Doors
- Vented Attic
- Insulated Gooseneck
- Rail-Tite Underbelly Seal
Dimensions
Weights
Capacities
Features
Operational
Chassis
Wheels & Tires
Product Photography
WARNING: Operating, servicing and maintaining a passenger vehicle, an off-highway motor vehicle or a recreational marine vessel can expose you to chemicals including engine exhaust,
carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary,
service your vehicle or vessel in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle or vessel.
For more information go to https://www.p65warnings.ca.gov/products/passenger-vehicle
and https://www.p65warnings.ca.gov/products/marine.