2026 Grand Design Momentum 399M

Grand Design Momentum 399M Toy Hauler – Premium RV Travel Trailer

Overview

Discover the Momentum 399M by Grand Design, a top-tier towable RV that blends luxury living with versatile toy-hauler practicality. This 2026 model accommodates up to 6 sleepers and features three expansive slideouts to maximize interior space. With a length of 44 feet 10 inches, a width of 8 feet 5 inches, and a height of 13 feet 6 inches, this travel trailer delivers comfortable, home-like living on the road. The floorplan showcases a front bedroom, a kitchen island centerpiece, and a mid living area designed for effortless entertaining. Outdoor enthusiasts will love the raised patio and dedicated outdoor entertainment, plus two entry doors for convenient access from different zones of the RV.

Key Features

• Residential-style kitchen: Microwave, Oven, Refrigerator, Stove
• Comfort systems: Water Heater, Air Conditioning
• Safety and reliability: Batteries, CO Detector, LP Detector, Smoke Detector, Fire Extinguisher
• Entertainment: Stereo System and TV
• Dining and storage: Free Standing Dinette with Chairs, Kitchen Sink, Pantry, Medicine Cabinet, Overhead Cabinetry
• Sleeping and bath: Queen Bed, Shower, Toilet
• Lifestyle flexibility: Washer/Dryer Prep
• Outdoor living: Outdoor Entertainment, Raised Patio
• Access and flow: Three Slideouts, Two Entry/Exit Doors

Interior Comfort & Layout

The Momentum 399M emphasizes a spacious, home-like interior with a kitchen island that serves as the hub for cooking and gathering. The free-standing dinette creates a comfortable dining area, while abundant cabinetry and a pantry supply generous storage. The front bedroom offers a peaceful retreat after a day of adventures, and the mid living space is designed to accommodate relaxation, games, and socializing. The washer/dryer prep adds flexibility for longer trips, making this model ideal for extended stays and full-time RV living.

Specifications & Capacity

• Brand: Grand Design Momentum — Type: Toy Hauler — Model: 399M
• Year: 2026 | Sleeps: 6
• GVWR: 22,500 lbs | Hitch Weight: 3,464 lbs
• Fresh Water: 140 gallons | Grey Water: 104 gallons | Black Water: 52 gallons
• Length: 44 feet 10 inches | Width: 8 feet 5 inches | Height: 13 feet 6 inches
• Slideouts: 3 | Number of Doors: 2

Why Choose the Momentum 399M

Ideal for families and adventurers who demand a durable, feature-rich recreational vehicle, the Momentum 399M delivers a compelling blend of high-end comforts and practical cargo-hauler versatility. The raised patio and outdoor entertainment extend living space outdoors, while the triple-slide design opens up the interior for easy movement and socializing. With residential appliances, robust safety features, and prep for washer/dryer, this luxury travel trailer stands out in the market as a premier choice for those seeking a reliable, stylish RV experience on the road.