- Front Private Bedroom
- Kitchen Island
- Hybrid Desk/Dinette
- Unobstructed Pass-Thru Storage
- Side Patio
Discover the ultimate combination of luxury, versatility, and adventure with the New 2026 Grand Design Momentum M-Class 399M, a top-of-the-line toy hauler designed for families, outdoor enthusiasts, and full-time RVers who demand space, comfort, and premium features. With its innovative layout, high-quality construction, and Grand Design’s reputation for reliability, the 399M is built for those who want the best in RV living and towing capability.
The rear garage area is a highlight of the 399M, perfect for transporting motorcycles, ATVs, or other outdoor toys. This space converts effortlessly into additional sleeping or living areas with drop-down sofas and overhead beds, providing flexibility for family, guests, or extra storage. The main living area features theater seating, a tri-fold sofa, and a centrally located entertainment center with a large TV, creating a cozy yet open space for relaxation and socializing. Large panoramic windows fill the interior with natural light, making the space bright, inviting, and connected to the outdoors.
The chef-inspired kitchen is equipped for convenience and efficiency, featuring solid-surface countertops, a three-burner cooktop, microwave, residential refrigerator, and ample cabinetry for storage. The dinette or optional free-standing table provides a versatile area for meals, games, or remote work, ensuring the Momentum 399M is as functional as it is stylish.
The front master suite offers a private retreat with a walk-around king bed, dual wardrobes, overhead storage, and privacy doors. The full bathroom includes a spacious shower, vanity, and thoughtfully designed storage, providing residential-level comfort no matter where the road takes you.
Built with Grand Design’s signature quality, the Momentum M-Class 399M boasts a durable chassis, premium components, and superior construction for long-lasting performance. Every feature is designed to make your travel experience smooth, comfortable, and worry-free.
Top Reasons to Buy the Momentum M-Class 399M:
Rear garage with convertible space for toys or extra sleeping areas
Spacious living area with theater seating and entertainment center
Chef-inspired kitchen with solid-surface countertops and storage
Private front master suite with walk-around king bed
Built with Grand Design’s durable construction and high-quality components
Why Buy from Campers Inn RV:
Since 1966, Campers Inn RV has been a trusted leader in the RV industry, offering transparent pricing, expert guidance, and one of the largest selections of high-end toy haulers in the nation. Their knowledgeable team ensures a smooth, stress-free buying experience and provides ongoing support long after your purchase. Choosing Campers Inn RV means gaining a reliable partner dedicated to helping you enjoy every mile of your adventures with confidence, comfort, and peace of mind.