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Grand Design Momentum 399M – Luxury Toy Hauler with Three A/Cs

  • Front Private Bedroom with King Bed
  • Kitchen Island & Hybrid Desk/Dinette
  • Side Patio with Exterior Griddle & 65" TV
  • 12' 6" Garage with Unobstructed Pass-Through Storage
  • Three A/C Units & 6k Watt Generator for Comfort & Power

Interior Features

  • Spacious living area with L-shaped sofa and recliners
  • Hybrid desk/dinette with windows for work or meals
  • Kitchen island with pull-out countertop extension, pantry, and full appliances
  • Full bath with shower, toilet, and sink
  • Front private bedroom with king bed slide out, large closet with washer/dryer prep, and dresser with TV prep

Exterior Features

  • Side patio with exterior griddle, 65" TV, and 1.7 cu. ft. refrigerator
  • 12' 6" garage for off-road toys with optional Liftsuite system
  • Unobstructed pass-through storage for gear

Packages & Additional Features

  • Solar + Package: roof-mounted solar with enhanced battery system
  • Comfort & Convenience: Three A/C units and 6k watt generator for extended off-grid living
  • Safety & Assurance: 7k axles with ABS drum brakes, MORryde CRE3000 suspension, and rubber pin box for smooth towing
  • Luxury & Design: Hardwood cabinet doors with hidden hinges, central vacuum system, and solid surface countertops

The Grand Design Momentum 399M combines residential comfort with extreme toy hauler capability. With three A/C units, a king bed, a fully equipped kitchen, and a 12' 6" garage, it’s perfect for both off-grid adventures and luxury living on the road.


Disclaimer: Contact us today to confirm availability, features, and options. Specifications are subject to change without notice.

New 2026 Grand Design Momentum M-Class 399M

Type: Fifth Wheel
Condition: NEW
Year: 2026
Manufacturer: Grand Design
Brand: Momentum M-Class
Model: 399M
Weight (Dry/Gross): 18000 lbs / --
Sleeps: 4
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