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2026 Grand Design Momentum 399M
NewStock #26-22890N
Listing price
2026 Momentum 399M
Other floor plans with a similar body style, feature mix, and price range, prioritizing other manufacturers and brands.
The Grand Design Momentum 399M puts its toy-hauler garage at the center of the adventure, with a rear ramp setup and optional aluminum deck system that expands the outdoor living space. Inside, a fireplace with electric heat, LED smart TV, Rockford Fosgate entertainment system, and matte black 20 cu. ft. refrigerator make the living area feel polished and comfortable. A one-piece fiberglass shower with glass door and teak bench, porcelain toilet, and dedicated bedroom storage round out the full-bath layout, while MORryde independent suspension, disc brakes, and a six-point hydraulic leveling system support confident setup and handling.
Length
44 ft 10 in
Dry weight
19,170 lbs
GVWR
23,500 lbs
Sleeps
5
Many factors play into a unit's listing price and what you should pay. This guide provides a ballpark estimate, but it does not factor in your exact scenario or how different listings are equipped.
There may be room for price negotiation.
$121,995 – $156,995
This unit has been on the lot for 91 to 120 days.
This unit is ranked 11 of 23 by asking price in this group.
Camperland of Oklahoma
Sapulpa, OK
Sells at about the same pace as other Oklahoma RV dealers
Compared with 17 dealers in Oklahoma
The Grand Design Momentum 399M fifth wheel toy hauler is engineered for uncompromising adventure and residential comfort. This premium toy hauler features a spacious 12' 6" garage, providing ample room for your toys or transforming into a multi-purpose living space. The forward area boasts a luxurious and comfortable living area with high-end finishes, ensuring you can relax in style after a day on the trails. Built with Grand Design’s signature quality, the 399M is made to last. Furthermore, it is backed by an exceptional warranty and dedicated customer support, giving you total peace of mind no matter how far off the beaten path you roam.
NEW 2026 Grand Design Momentum 399M Hitch: 3,464 lbs.UVW: 18,000 lbs.Length: 44' 10" Sleeps:up to 6
Stock: 26-22890N • Location: Tulsa
You can camp with confidence. Grand Design is built to a higher standard and backed by a 1-year limited, 3-year structural, and 5-year frame warranty.
Enjoy your tunes the way they are meant to be heard with high quality Rockford Fosgate sound.
Extend your camping season and stay comfortable in virtually any weather with Grand Design's robust 4-seasons package.
Control lighting, slide-outs, leveling and awnings, monitor tire pressure and system status in the palm of your hand.
Stay cool in the hottest weather with the ability to run 3 15k BTU A/Cs at the same time. This unit is equipped with a third A/C.
Towing technology designed to let you haul safer and smarter than ever before.
Sorry, 360 Tour is not available for this model.
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