2026 GRAND DESIGN MOMENTUM 399M
Description
NEW 2026 GRAND DESIGN MOMENTUM M CLASS 399M – 338373
Grand Design Momentum fifth wheel toy hauler 399M highlights:
Front Private Bedroom
Kitchen Island
Hybrid Desk/Dinette
Unobstructed Pass-Thru Storage
Side Patio
This toy hauler has all the comfort and convenience you could ask for! Once you have unloaded your toys from the 12' 6" separate garage, you can start lunch on the exterior griddle located by the side patio. There is also a 65" TV here and a 1.7 cu. ft. refrigerator to entertain guests! If the weather isn't cooperating, you can make meals in the fully equipped interior kitchen, complete with an island, pantry, pull-out countertop extension and more. An L-shaped sofa with recliners is in perfect view of the 50" TV and fireplace, and there is even a hybrid desk/dinette with windows where you can get some work done if needed. Head towards the front to freshen up in the full bath before heading to bed in the private bedroom. Here, you'll find a queen bed slide out with an optional king bed, a large closet with washer and dryer prep, plus a dresser with TV prep if you want the option to watch movies in bed!
The Momentum fifth wheel toy haulers by Grand Design are built for four seasons of travel with your off-road toys and include luxurious accommodations throughout for extreme living! Each is constructed to a superior standard with the fully enclosed and heated underbelly and storage area, the 5-sided aluminum cage, and the triple insulated garage floor. The MORryde CRE3000 suspension system and rubber pin box, plus the upgraded axle hangers provide the performance and smooth towing you desire, while the interior offers luxury such as color changing LED accent lighting, hardwood cabinet doors with hidden hinges, and a central vacuum system. Each toy hauler also includes four packages, including the Garage Package with Tuff-Ply gas and oil-resistant flooring, the Weather-Tek Package with a Stealth AC System, and the Interior Luxury Package with solid surface countertops!
Mileage: 0
Height: 13
InternalHeight: 8Specifications
Stock Number338373
VIN573FM4735TBB04543
Year2026
CategoryFifth Wheel Toy Haulers
ManufacturerGRAND DESIGN
ModelMOMENTUM 399M
LocationAshland, Virginia 23005
ConditionNew
Fresh Water Tank Capacity140 gal
Gray Water Tank Capacity104 gal
Black Water Tank Capacity52 gal
Sleeps4
Number of Slide Outs3
Hitch Weight3,406 lb
Exterior Length3 ft 8 in
Exterior Width8 in
Shipping Weight19,310 lb
Stock Number338373|
VIN573FM4735TBB04543|
Year2026|
CategoryFifth Wheel Toy Haulers|
ManufacturerGRAND DESIGN|
ModelMOMENTUM 399M|
LocationAshland, Virginia 23005|
ConditionNew|
Fresh Water Tank Capacity140 gal|
Gray Water Tank Capacity104 gal|
Black Water Tank Capacity52 gal|
Sleeps4|
Number of Slide Outs3|
Hitch Weight3,406 lb|
Exterior Length3 ft 8 in|
Exterior Width8 in|
Shipping Weight19,310 lb|
