Models Starting at $153,076

Here’s to worn out welcome mats.

Play hard. Rest Easy.

The Momentum series has truly raised the bar when it comes to Toy Haulers. With plenty of space for taking it easy and a garage for leaving the mess, the Momentum was meant for living well and playing hard.

2025 Top Innovation - Momentum LiftSuite System

Transform your lifestyle with the industry's most versatile garage space - LiftSuite^TM Garage System. This award-winning innovation is built with our exclusive P2K Bed Lift System and versatile convertible seating that creates a true multi-function space – from toy storage to luxury suite in just minutes.

Its tech-savvy single track design is engineered to allow for a cascade of natural light through expansive windows.

We've installed additional light fixtures under the bed that shine directly down, rather than on the sides of the room, allowing for maximum light exposure to light your entire area. This garage exemplifies why we proudly hold the title of the #1 selling toy hauler. Now standard on all Momentum fifth wheels.

Watch this demonstration on how to convert the garage

17.5" All-Steel H-Rated Tires

Chip Guard: Protects from chips or cuts

Scrub Guard: Minimizes wear from starts, stops, tight turns and curb impacts.

Travel with Confidence.

Industry-first Anti-lock Braking System for Towables.

Experience the most advanced braking system for RVs on the market today. The ABS combines all the critical components of a vehicle-based braking system, such as its sensors and actuators—adapted to operate independently within RVs—to provide the driver with added control over steering while braking in slippery conditions or on rough terrain.

LEARN MORE

When it comes to suspension performance, it’s all about suspension travel. Increased travel means smoother towing, improved towability and better protection from damaging road shock.

Run THREE 15K ACs at the SAME TIME!

We combine high efficiency AC’s and an energy management system to achieve the perfect balance of efficiency and power!

Add an Optional 3rd AC for Maximum Cooling Power!

ULTRA QUIET

Up to 2x Quieter than the competition

MAXIMUM
AVAILABLE COOLING POWER

Dual 15,000 BTU A/Cs and an optional 3rd A/C

AIRTITE CONNECTORS

All duct pieces are securely fastened together using special connector brackets.

Stealth Smart AC Duct Efficiency Diagram

Grand Design Exclusive Super Chassis Design

Exclusive Grand Design Super Chassis Design

101" Wide Body Chassis

A full 5” wider than many coaches in its class, the widebody chassis allows for more livable floor space with deeper sliderooms, wider sofas in rear lounge models, and space saving sliding pocket doors into the bathrooms…all at a shorter towing length.

No Wheel Wells

A true toy hauler with no wheel wells to maximize cargo option. Not to mention more floor space for camping.

Dovetail Entry

Dovetails ensure you have a longer ramp and softer angle for loading your toys.

Wide Rail Design

Heavy duty I-beam main rails are placed further outward on the chassis. This wider rail placement provides a more stable jack stance, and allows for the slideroom gearpacks to be enclosed inside the frame rails (rather than outside).

No Wheel Wells

A true toy hauler with no wheel wells to maximize cargo option. Not to mention more floor space for camping.

Dovetail Entry

Dovetails ensure you have a longer ramp and softer angle for loading your toys.

Rockford Fosgate + Fifth Wheels

Shake it up with Rockford Fosgate. Includes Rockford Fosgate head unit, interior and exterior speakers, an amplified subwoofer and over 500 watts of power!

Stage 1 Package - 500+ Watts of Total Power (Standard):

Rockford Fosgate Source Unit (App Controllable)
10" Powered Interior Subwoofer
6.5" 3-Way Interior Speakers

Stage 2 Package - 900+ Watts of Total Power (Optional):

Rockford Fosgate Source Unit (App Controllable)
10" Powered Interior Subwoofer
Six 6.5" 3-Way Interior Speakers
10" Exterior Subwoofer
Two 6.5" Color Optix™ 2-Way Speakers
400 Watt 4-Channel Amplifier
Exterior Rockford Fosgate Source Unit (App Controllable)

MORE TIME. MORE PLACES.

SOLAR POWER NOW COMES STANDARD

Camp longer and in more places with the factory-installed 330W Roof Mounted Solar Panel, 50 AMP Charge Controller with Bluetooth Module, Inverter Prep, (2) USB Dock Ports, and 20 cu. ft. 12V Refrigerator standard on all Momentum's. No camping spot is off-limits. Just add batteries and go. Camp where you want, when you want*.

INCLUDED IN THE STANDARD SOLAR PACKAGE FOR MOMENTUM'S:

330W
Solar Panel

50 AMP
Charge Controller

20 cu. ft.
12 VOLT
Refrigerator

*We may have gotten a little excited, please camp safely. Follow all laws and abide by no trespassing signs, you know what we mean.

Constructed to a Superior Standard

Thermal Roof Design (R-40)*
Fiberglass insulation and a layer of radiant foil insulation cover the roof. Grand Design goes further by extending both insulation layers the full length of the roof and around to the bottom of the front cap.

Full Laminated Walls (R-11)*
Sidewalls, ramp door, slideroom endwalls, and slideroom roof are all welded aluminum framed and laminated with rigid foam insulation. Many others use wood framing and soft fiberglass insulation in the sliderooms that can settle over time and leave uninsulated air gaps.

Triple Insulated Main Floor (R-45)*
The underbelly is lined with a radiant foil insulation barrier (Layer 1) and is then covered with fiberglass insulation that wraps all the way up the sides of the frame rails (Layer 2). The main floor enhances the R-Value with yet another layer of fiberglass insulation (Layer 3).

Triple Insulated Garage Floor (R-40)*
While many toy hauler garage floors are NOT insulated, our exclusive garage floor design provides 3 layers of insulation. A base layer of radiant foil insulation (Layer 1) is topped with fiberglass insulation (Layer 2), and finishes with a second layer of radiant foil insulation on the underside of the garage floor (Layer 3).

Product Line Specifications

397THS

UVW

Hitch

GVWR

Length

Height

Fresh Water

Gray Water

Waste Water

Fuel Capacity

Garage Length

Sleep Capacity

Num Slides

Bathroom Access*

MSRP

397THS

15,600 lbs.

3,375 lbs.

22,500 lbs.

44' 2"

13' 6"

140 gal.

104 gal.

60 Gal.

13' 6"

Yes

$153,678

410TH

16,800 lbs.

3,600 lbs.

22,500 lbs.

44' 11"

13' 6"

140 gal.

104 gal.

60 Gal.

13' 6"

Yes

$153,076

*Bathroom Access with slides in

Here is what customers have to say...

I enjoy the simplicity and the build of the unit. You can tell a lot of thought was placed in setting up the design. It has the filling of a small apartment on wheel. Following and handling is superb I enjoy the comfort that it offers with residential appeal and large storage places.

JERRY J, Ten

This is our second Grand Design. First one being a Solitude and this one a Momentum. This is our 5th one that we have owned. All of them have been fifth wheels. 3 of them have been toy-haulers. We are really enjoying the design of the 395ms-r. For us the floor plan feels warm and inviting. Comfortable living while out on the road is an understatement. The quality of our GD far exceeds that of the other RVs we looked at purchasing this time. The systems are well thought out and good design. Ken

KENNETH S, TX

We recently purchased a Grand Design Momentum 376THS from McClain's RV in Fort Worth. Our expectations were exceeded by McClain's RV and Grand Design. We searched for two years and settled on the 376THS design because it met our desired requirements. Our unit was delivered two plus months earlier than expected. We started with a 5-week shake out trip and learned how much we enjoy the 376THS. Thank you to McClain's RV in Forth Worth and Grand Design for creating the 376THS.

STEPHEN M, CO

This is now our second GD trailer. We were looking for a Toy Hauler and after watching far too many YouTube reviews, finally visited our local dealer who thankfully has an excellent full lot of various makes. We made a very conscientious decision to start at the lower end of what we were looking for and move up in various brands, costs and sizes before visiting the Momentum we knew we would like. As we thought, walking into the GD trailer after seeing the others was night and day!

DENISE F, ON

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Models Starting at $153,076

Here’s to worn out welcome mats.

Play hard. Rest Easy.