2026 Grand Design Momentum 399M, 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! And if you have guests staying over, you can choose to add the optional Liftsuite system with underside can lights in the garage. 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 independent suspension 2.0 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!

 

OPTIONS:

Luxury Interior Package Exterior Package Garage Package Weather-Tek Insulation Package Under Unit LED Light Kit Bedroom A/C Kitchen Power Fan w/Rain Sensor Garage LED HD TV Auxiliary Fresh Water Tank  20 cf. 12V Refrigerator OmniConnect - Satellite, Cellular and Wifi Internet Prep Upgraded H-Rated Tires w/17.5" Wheels SafeRide RV Roadside Assistance King Bed Upgrade Rockford Fosgate Stage 1 Stereo 500 Watts Int/Ext Speaker Upgrade w/10" Powered Sub 6KW Generator Gen III 3 Season Door w/Slidi