Best Grand Design Momentum Floorplans: Everything You Need To Know

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The best Grand Design Momentum toy hauler units have many options that make living in an RV almost like living in a sticks and bricks house. From an island in the kitchen across from the residential refrigerator to a queen or king-sized bed, there is room for the whole family, or at least for your whole family of toys that could fit in the garage.

Most of the Grand Design Momentum units have similar features like the option for a king-sized bed and the no-crank digital TV antenna with a booster that comes standard. Each unit, except for one, in this list has solar and generator prepped in the unit, but the components are extra. The base units are around $17,000.

Owners of Grand Design Momentum’s rave about the quality and options available.

Grand Design Momentum 399TH

Grand Design Momentum 399TH

The Grand Design Momentum 399TH has a front bedroom with a private bath and shower. A queen bed is standard, but there is the option for a king-sized bed. The kitchen has a center island with the sink in the middle and space for two barstools, an 18-cubic foot refrigerator, microwave, and range. There are TVs in the bedroom, the exterior of the unit, and in the living room.

The garage has the option for an overhead bed, a small water closet, and a fold-down side patio. The rear has a drop door with the patio option and a second set of steps off the rear side.

In the living room across from the kitchen, there is the option for a dining table with four chairs and two theater seats, or a super sofa that takes up the entire slide.   

The GVWR is 20,000 pounds. The hitch weight is 3,400 pounds, and the unit has a length of 43’1”. Fresh water capacity is 155 gallons and the grey and black tanks each have a 104 gallon capacity. It has a central vacuum system.

On the exterior, the Grand Design Momentum 399TH has an under mount 16” spare tire and a 6-point hydraulic leveling system. Solar is prepped and there is the option to add a Solitude Solar System with a 300-watt solar panel, controller and 2,000 watt inverter. It is ready for a generator, which is optional.

Packages are offered for the exterior, garage, interior and Weather-Tek.

Grand Design Momentum 397TH

Grand Design Momentum 397TH

The Grand Design Momentum 397TH is a toy hauler with a GVWR of 20,000 pounds, a hitch weight of 3,375 pounds, and a length of 43’1”.

The bedroom is on the front of the unit with a queen bed, but option for a king. Ther eis also a full bathroom. The middle kitchen has an island with an extend counter for two barstools. The kitchen also has a microwave, 18-cubic foot refrigerator, range with a window behind it.

Interior features also include coloring changing LED accent lighting, sofa with headrest, removable swivel tables, including heat, massage, and LED lights. There is a wall-mounted table with four chairs. The slide can be changed out with the optional super sofa instead of the table and two seats. The unit has a central vacuum system.

On the exterior of the unit, it has a fresh water capacity of 155 gallons, grey water capacity of 104 gallons and waste water capacity of 104 gallons.

The floorplan also comes with an under-mount 16” spare tire, 6-point hydraulic leveling system, and hookups for an optional backup camera.

There are many options in the 12’6” garage area from folding sofas to 3-season walls. A TV prepped area is in the garage and an exterior entertainment system with LED TV and DVD. There is also a bathroom in the garage.

The unit is prepped for solar and can have a Solitude Solar System with 300-watt solar panel, controller and 2,000 watt inverter added on.

Grand Design Momentum 376THS

Grand Design Momentum 376THS

The Grand Design Momentum 376THS floorplan is unique since it has a hidden garage that doesn’t take up living space. It has a raised rear bedroom with a full bathroom. The bed is queen-sized with the option to make it a king bed that raises and lowers since it serves as the roof for the garage. This allows the garage to accommodate different height toys. Over the hitch, there is a living space with two tri-fold sofas and another sofa with theater seating including heat, massage, and LED lighting. It also has a standard central vacuum system. The TV rises from the cabinets in the very front of the unit.

The kitchen features an island, 18-cubic foot refrigerator, microwave, range, and also a free-standing dinette. The island has room for two barstools. The unit has a spot prepped for a washer and dryer.

The GVWR is 20,000 pounds, the hitch weight is 3,250 pounds, and the length is 41’3” with fresh water capacity of 157 gallons, a grey tank that holds 104 gallons and the black water tanks holds 52 gallons. The unit has upgraded axle hangers.

Grand Design Momentum 350M

Grand Design Momentum 350M

The Grand Design Momentum 350M is dealer stock only. This shorter unit at 38’9”, weighs 16,500 pounds and has a hitch weight of 2,825 pounds. The 350M has a front bedroom with a queen bed and king-sized optional. There is a good-sized bathroom just outside the bedroom. The kitchen features an ell with the sink facing the room, a 30-inch stainless steel microwave with exterior vent, range, and 18-cubic foot refrigerator. There is a four-seat sofa in the room with a table in front of it that can also be stored away. There is a central vacuum system.

The 11-foot garage can be upgraded to a 14-foot garage with a different model number. There is a second bathroom with a toilet and sink near the garage. There are many options for the garage configuration like additional beds or a table for an onboard office.

The freshwater tank can hold 117 gallons and the grey and black tanks both hold 78 gallons. It has rear cargo loading and backup LED lights. It is wired for solar and you can add the Solitude Solar System. There are many packages to choose from when considering upgrades.

Grand Design Momentum 351M

Grand Design Momentum 351M

The Grand Design Momentum 351M has a front bedroom with a bathroom on the same level. The kitchen is in the middle features an island with barstool seating and a four-seat sofa with a stowable table, 30-inch stainless steel microwave with exterior vent, and an 18-cubic feet refrigerator. In the master bedroom, there is a queen bed, but it can be upgraded to a king bed. There is under bed storage. Many of the audio and video options come with an additional charge. The unit is set up for solar power and a generator.

It has an 11-foot garage with options for sleeping bunks. The garage is loaded from the rear. Patio system and patio steps can be added as an option.

The GVWR is 16,800 pounds with a hitch weight of 2,785 pounds. It is 38’6” long.

Grand Design Momentum 395M

Grand Design Momentum 395M

The Grand Design Momentum 395M is a 41’11” long toy hauler that is 20,000 pounds GVWR, with a hitch weight of 3,150 pounds. The garage is a roomy 12’6” long.

There are lots of options for seating in this unit with the choice of a super sofa with five seats in the slide out plus an additional ell shaped seat in front of the TV. Or, choose two theater seats with a free standing dinette in the slide. The kitchen is more compact with a small counter for the sink. There is the range, microwave, 18-cubic foot refrigerator and pantry. There is an optional toilet and sink in the garage or bedding options, or just use it to haul all of your outdoor toys.

The bedroom is in the front of the unit with a queen bed standard, but the option for a king bed. The unit is prepped for solar and a generator. The packages can offer upgrades in all areas of the rig.

Grand Design Momentum 21G

Grand Design Momentum 21G

If you’re not looking to tow something in the 40-foot range, check out the Grand Design Momentum 21G. At just 26’11” long, it only weighs 6,400 pounds and can hold up to 9,995 pounds.

The unit has a front bedroom and the only bath in the unit is accessible from the bedroom and the front entryway. The bedroom has a queen bed that slides out to make more room. The living area has two euro chairs and the open kitchen has a double door refrigerator, stainless steel accented microwave, 3-burner range with oven and sink as well as a sink cover for more prep space.

The Grand Design Momentum 21G comes with Rockford Fosgate exterior Speakers and the Rockford Fosgate Speaker package with powered sub, which most of the other units also had standard.

It has a 100 gallon fresh water tank and the grey tank holds 74 gallons, while the black water tank holds 39 gallons. The garage has Happi Jac rollover sofas and table with a top bed as an option. There is a ramp door and patio.

Outside, the unit there is a folding roof ladder, easy access low point drain valves, insulated storage doors, backup camera prep, full size spare tire and carrier, high capacity water pump and an extra large 1 1/2” fresh water drain valve.

Upgrades include a luxury interior package, exterior package, garage package and insulation package.

Being smaller, it also comes with a smaller price tag in the $14,000 region. 

Don’t need a toy hauler? Check out our list of the best Grand Design Solitude Floorplans or our tips for choosing a floorplan that’s right for you!

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  1. We don’t have a Grand Design, but we love our 5th wheel Toy Hauler. Wouldn’t have anything else.

  2. The problem with the 376ths is there isn’t a lot of room in the garage & no windows. Doesn’t make a very nice office. The 320G is a good option. Nice garage 2bd bathroom & Washer/dryer option

  3. I am shopping, but the 397TH checks all the blocks so far. My one concern is just how big it is and how that limits access to some places.

  4. We waited three years to finally get a Solitude 374TH! It is just what we wanted and we actually were able to find a used model less than a year old with full body paint, Linen interior and a residential refrigerator. The traditional toyhauler isn’t conducive to our style of camping as we feel they are too contemporary and clump the living area into a small space. We want the garage for the motorcycle and RadMinis exclusively, so we didn’t need sofas and beds. Grand Design ceased producing the Solitude toybox floorplan, but still makes the Momentum 376TH.

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