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2026 Grand Design Momentum 397TH
NewStock #358314
Listing price
2026 Momentum 397TH
Other floor plans with a similar body style, feature mix, and price range, prioritizing other manufacturers and brands.
The 397TH earns its reputation as one of the more luxurious toy haulers on the market. Triple axles with 17.5" H-rated tires handle the nearly 20,000 lb max weight with confidence, while 3,800+ lbs of cargo capacity means you're not leaving anything behind. Inside, the garage space transforms around a massive 5-person super sofa, and the front bedroom suite feels genuinely residential rather than like an afterthought. Grand Design included a kitchen island and residential stove, and the dual-pane windows are a real-world touch that owners specifically call out for eliminating condensation issues. Grand Design's warranty reputation is a known selling point here. Owners consistently describe claims being handled with minimal friction.
Length
44 ft
Dry weight
17,514 lbs
GVWR
20,000 lbs
Sleeps
8
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General RV
Draper, UT
Sells faster than 89% of US RV dealers
Compared with 1,116 dealers nationwide
The 2026 Grand Design Momentum 397THS is a flagship luxury toy hauler built for travelers who demand residential comfort, massive cargo capacity, and rugged off‑grid capability. At over 44 feet long with a triple‑axle foundation, the 397THS delivers exceptional stability, storage, and towing confidence.
The 13'6" garage transforms from a high‑capacity cargo bay into a fully functional living space with a half bath, Happi‑Jac queen bed, rollover sofas, and its own entry door. Whether hauling ATVs, motorcycles, kayaks, or a side‑by‑side, the garage is engineered for serious adventure.
Inside, the main living area features opposing slides, a large entertainment center, theater seating, a tri‑fold sofa, and a spacious kitchen with a 20‑cu‑ft 12V refrigerator, convection microwave, and a large island. The panoramic windows and high ceilings create an open, residential feel.
Up front, the master suite includes a king bed, large wardrobe, washer/dryer prep, and direct access to the luxurious full bathroom with a 48" x 30" shower and molded seat. The Stealth 3+ A/C system provides 30,000 BTU of ultra‑quiet cooling, while the 40,000 BTU furnace and tankless water heater ensure year‑round comfort.
With three awnings, a 60‑gallon fuel station and generator, the Momentum 397THS is built for extended stays, remote camping, and high‑end adventure living. It’s a true luxury home on wheels designed for travelers who want capability without compromise.
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