2027 Grand Design Momentum 399M White

2027 Grand Design Momentum 399M White

TOY HAULERS

Pack More Fun into Your Road Trip with a Toy Hauler RV

A toy hauler RV is a type of recreational vehicle that is designed to transport both people and their toys, such as motorcycles, ATVs, and jet skis. It typically features a garage area at the back of the RV with a large ramp door that can be used to easily load and unload the toys. The garage can be converted into a living space, such as a bedroom or dining area, when the toys are removed.

The main difference between a toy hauler RV and a non-toy hauler RV is the garage area. Non-toy hauler RVs typically do not have a garage, but instead have more living space, such as additional bedrooms or bathrooms. Toy hauler RVs are ideal for those who love outdoor activities and want to bring their toys along with them on their travels.

Owning a toy hauler RV has several pros and cons. Pros include the ability to bring along toys on trips, the versatility of the garage space, and the potential for resale value. Cons include the higher cost of a toy hauler RV compared to a non-toy hauler RV, the additional weight and length of the RV, which may make it more difficult to drive, and the need for regular maintenance and repairs to the garage area.

Ultimately, the decision to own a toy hauler RV depends on an individual's specific needs and preferences. Those who enjoy outdoor activities and want to bring their toys along on their travels may find a toy hauler RV to be the perfect fit for their lifestyle.

Take Your Family Adventures to the Next Level with the Grand Design RV Momentum G-Class Fifth Wheel

The Momentum G-Class fifth wheel from Grand Design is a perfect choice for those who want to take their outdoor adventures to the next level. Boasting superior construction, this fifth wheel is built to last with fully laminated sideboxes and an R-40 garage floor, making it durable and reliable for all types of terrain and weather conditions. The Momentum G-Class offers spacious and functional floorplans that are perfect for families who enjoy power sports and outdoor experiences. Quality craftsmanship is evident throughout, making the Momentum G-Class a luxury toy hauler that doesn't compromise on functionality.

But it's not just the construction and features that make the Momentum G-Class stand out. Grand Design offers the industry's best warranty, ensuring that customers can travel with confidence knowing that they have the support of a company that stands behind their product. And with industry-leading customer support, Grand Design is always available to assist customers with any questions or concerns they may have. Plus, as part of the vibrant and growing community of Grand Design owners, customers can connect with like-minded individuals who share a passion for outdoor adventure. With the Momentum G-Class fifth wheel from Grand Design, the possibilities are endless.

12'6'' Garage Length

"The over 12-foot garage offers exceptional versatility, giving you plenty of room to haul ATVs, motorcycles, or other gear with ease. When the toys are unloaded, the space quickly transforms into a flexible living, sleeping, or entertainment area to fit your needs. It’s designed to adapt, making every trip more functional and enjoyable.

Spacious Entertainment Room w/ Theater Seating

This spacious entertainment room is designed for ultimate comfort, featuring an L-shaped couch with built-in recliners. Additional theater-style seating ensures everyone has a great view and plenty of room to relax. It’s the perfect setup for movie nights or unwinding after a long day.

Party Patio Outdoor Kitchen

Enjoy more outdoors with an easy fold out side patio equipped with a full-service kitchen featuring a 15" sink, expansive food prep counter top, griddle, pull-out cutting board, hideaway trashcan and 65'' flatscreen TV that keeps the fun sizzling all season long.

Worry-Free Fiberglass Roof

A Grand Design exclusive, this low-maintenance roof is engineered for exceptional durability and impact resistance from hail, low-hanging branches, and the unexpected. Constructed from a single seamless deck with no OSB or wood layers, and reinforced with marine-grade fiberglass and precision wrap-around edging, it eliminates common weak points—helping prevent leaks, resist cracks, and minimize yearly upkeep while delivering lasting performance you can trust.

MorRyde Independent Suspension

Glide your unit easily over uneven and rough roads with individually responding wheels to give you an amazing towing experience as well as protecting your trailer from damaging road shock.

Brass Fittings

Ensure long-lasting performance with corrosion-resistant brass fittings that maintain strong, secure plumbing connections.

Hideaway Entertainment Wall

An easy-open hideaway accent wall with a mounted 50'' inch flatscreen TV opens up to an organizational closet featuring deep storage, including a designated vacuum compartment for all traveling extras.

Pull-Out Counter Top

Maximize your kitchen counter space with an extendable pull-out counter extension for better mealtime convenience.

Electric Happi-Jac Bunk System w/Folding Sofas

Electric Happi-Jac system with folding sofas transforms your space at the touch of a button, from garage to living area

Fiberglass Slide-Out Roofs

Engineered for greater durability and long-term protection, fiberglass slide-out roofs provide a stronger, more resilient barrier against harsh weather, falling debris, and everyday wear. Unlike traditional materials that can crack, bubble, or deteriorate over time, the seamless fiberglass construction helps resist moisture intrusion while reducing maintenance—giving you added confidence wherever the road leads.

Full-Swivel Kitchen Table

Engineered to utilize the most out of your dining space, this four-person full-swivel table can be tucked under the counter creating a desk workstation/bar or pulled out as soon as dinner's ready. With an additional sliding mount system for 70 inches of horizontal slide room, you can customize your space exactly how you need it.

Continuous Armstrong Resilient Flooring

Durable flooring stretches the entirety of the interior resulting in a unified look with the enhanced resilience of a garage floor but the aesthetic of a modern home.

Optimal Linen Deep Storage

Stay organized, clean, and clutter-free with the linen storage system, built right into the bathroom. Featuring plenty of room for towels, toiletries, linens, and pull-out clothes hamper it maximizes vertical space while keeping everything neatly in place—even on the move.

Lippert TPMS

Monitor tire pressure and temperature in real-time, preventing blowouts and ensuring safer travel with instant alerts to your device.

Insulated Garage

Fully insulated garage space maintains comfortable temperatures year-round, protecting your gear while creating a comfortable living environment.

Creative Cabinetry

Bring residential refinement on the road with soft-close doors and drawers, durable hardwood dado-cut drawer boxes, discreet electronics charging drawer, and a convenient bathroom hair accessory door for smart, everyday organization.

Sunken Shower

Extra-tall 6'11" sunken shower with skylight brings spa-like comfort to your adventures, offering more space and natural light for a superior experience.

Zero Gravity & Weather Proof Ramp Door

Load your toys with ease using our zero-effort ramp door system, featuring weather protection and single-handed operation for hassle-free adventures.

6-Point One-Touch Electric Auto-Leveling

Achieve perfect leveling in seconds with one-touch auto-leveling, making setup quick and hassle-free.

OmniConnect

Whether Starlink, Cellular, or WiFi, this Toy Hauler is prepped to connect to internet any way that best fits your needs. No need to change providers and update connections just to enjoy a get away in your favorite RV.

Best-In-Class Warranty

Enjoy peace of mind with the industry-first 1-3-5 transferable warranty. Receive exceptional value and protection with 1 year base, 3 year structural, and 5 year frame—all transferable!

Features May Include:

KITCHEN

• 30" OTR Microwave
• Professional Grade 4-Burner Cooktop w/24" Oven
• 12-Volt High Power MaxxAir Fan w/Rain Sensor
• Smart Sink w/ removeable cutting board, produce strainer and glass rinser

APPLIANCE

• Fireplace with Electric Heater
• Matte Black 20 cu ft Refrigerator
• 30" Over-The-Range Microwave

HVAC

• 12V High Power Fan (Kitchen)
• 35K BTU High Capacity Furnace
• Fireplace w/ 5,000 BTU Electric Heater
• StealthAC Smart System
• Attic Vent
• High Capacity Heat Ducts

ELECTRONICS

• OneControl™ System
• Back-Up Camera Prep
• Exterior Cable/SAT Plug-In
• LED Smart TV in Living Area
• Rockford Fosgate Stereo Entertainment System w/HDMI and App Controls
• Exterior Speakers
• No-Crank Digital TV Antenna w/Booster
• LED TV in Garage
• OmniConnect On-Board WiFi Ready

RUNNING-GEAR

• Heavy Duty H-Rated Tires
• 17.5" H-Rated Aluminum Wheels
• MORryde® Independent Suspension 2.0 w/disc brakes

FRAME-CHASSIS

• 6-Point Hydraulic Leveling System
• MORryde® Pin Box
• 101" Wide Body Super Chassis w/Drop-Frame Storage

EXTERIOR

• Keyed Alike™ Ramp Door Latches
• 2nd Patio Awning w/ LED Lights
• 3rd Awning w/ LED Lights
• High-Gloss Gel Coat Exterior Sidewalls
• Door Side Exterior Spray Port
• Frameless Tinted Windows
• Walk-On Roof
• 17.5" Spare Tire (Undermount)
• MORryde Strut Assist Entry Step
• Slam-Latch Baggage Doors
• Mo SecureGen III 3 Seasons Doors (Opt)

CONSTRUCTION

• New Worry-Free Composite Roof w/ Lifetime Warranty
• 101" Wide Body Construction
• 5-Side Aluminum Cage Construction
• Fully Enclosed and Heated, Underbelly and Storage Area

BATHROOM

• Skylight Above Shower
• Porcelain Toilet
• Medicine Cabinet w/Mirrored Door
• One-Piece Fiberglass Shower w/Glass Door & Teak Bench Seat

BEDROOM

• Under Bed Storage Area
• Individually Switched Reading Lights Over Bed
• Bedside 110-Volt & USB Outlets
• 60" X 80" Queen Bed Pillow Top Bed Mattress

PLUMBING

• Exterior Spray Port (Door Side)
• 12V Tank Heaters
• Sewer Hose Storage Area
• Whole House Water Filtration System
• All-In-One Enclosed and Heated Utility Center
• Brass Plumbing Fittings w/ Shut Offs

ELECTRICAL

• Solar Prep (10 gauge wiring with universal MC4 connectors)
• 75 Amp Converter
• 12V Battery Disconnect

INTERIOR

• Interior LED Accent Lighting
• Hardwood Cabinet Doors w/Soft Close Hidden Hinges
• Recliner Sofa w/Adjustable Headrest or Flip Down Cupholders
• Central Vacuum System w/ Tools and Dust Pan
• Undermount soft-close drawer glides
• Hardwood drawer boxes