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NEW 2026 Grand Design Momentum 399M Toy Hauler Elevate Every Adventure

If you ve been searching for a fifth wheel toy hauler that checks every box power, luxury, workspace, entertainment, and real off-grid capability the Momentum 399M was built for you. Grand Design s flagship toy hauler welcomes thrill-seekers and full-timers alike with refined residential comforts and rugged durability that can keep up with wherever your journey leads.

Load Up, Level Up, and Live Large
The 12' 6" separate garage gives you the freedom to bring quads, dirt bikes, kayaks, e-bikes anything that fuels your weekends. Once unloaded, transform the space into an extra suite with the optional Liftsuite system, complete with under-glow accent lights for a premium touch. And when you want to take the party outside, the side patio becomes your open-air living room outfitted with a 65" TV, a 1.7 cu. ft. fridge, and an exterior griddle to keep everyone fed and smiling.

A True Chef's Kitchen Indoors or Outdoors
Rainy day? No problem. The interior kitchen is a culinary playground, featuring a kitchen island, pull-out countertop extension, deep storage, pantry, and upscale appliances. Whether you re prepping trail-day snacks or hosting friends for dinner, you ll have the space and style to do it right.

Relaxation Worth Coming Home To
Kick back in the main living area where an L-shaped reclining sofa faces a