2026 Grand Design Momentum 399M - 15270
For Sale in Fort Worth, TX.
PRIMARY INFORMATION
- Stock #15270
- Year2026
- ManufacturerGrand Design RV
- MakeGrand Design
- ModelMomentum
- Floorplan399M
- TypeToy Hauler
- ConditionNew
- Mileage10
- Length44' 0"
- VIN573FM4734TBB04615
- MSRP$189,230.00
- Sale Price$129,995.00
SPECS
- Chassis101" Wide Body Super Chassis w/Drop-Frame Storage
- Sleeps6
- Water Capacity (Fresh)140 gal
- Water Capacity (Black)52 gal
- Water Capacity (Grey)104 gal
- Air Conditioners1
- A/C Spec30,000 BTU
- GVWR22,500 lbs
- Slideouts3
- Dry Weight18,000 lbs
- Payload Capacity4,500 lbs
- Tow/Hitch Weight3,464 lbs
Description
The 2026 Grand Design Momentum 399M is a high-end, large toy hauler designed for serious adventurers who want both massive garage space and full residential comforts. At 44′10″ in length, 13′6″ in exterior height, and with a GVWR of 23,500 lbs, it offers over 19,000 lbs of dry weight—plus a hitch (pin) weight around 3,400 lbs.
Its garage spans about 12′ 6″, letting you haul large bikes, ATVs, or gear. A side patio, third awning, and exterior entertainment features extend the fun outdoors. Inside, you’ll find three slide-outs to expand living space, with an interior height of 8′ 5″ for an open feel. The kitchen features a large island, stainless steel 20 cu ft refrigerator, three-burner cooktop, and full pantry.
On the comfort side, there’s a large front bedroom with queen bed (king optional), a full bath, plus multiple entertainment zones: a 50″ living room TV, 32″ in the garage, and a 65″ TV on the patio. The 399M also comes with features built for tougher conditions: aluminum-cage construction, Weather-Tek insulation package, enclosed underbelly, and heavy-duty axles & tires.
All told, the Momentum 399M is made for those who want both the capacity to haul serious gear and the luxury to live comfortably on the road or at base camp.
