Used 2022 Grand Design RV Momentum M-Class 398m for sale at Blue Fox RV in North Logan, UT. Sleeps 11, 43.9 ft long, 3 slides. Listed at $89,995.
Listing last updated .
2022 Grand Design RV Momentum M-Class 398m
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Built for the road, ready for your next trip.
Grand Design Momentum M-Class toy hauler 398M-R highlights:
- Separate Garage (See photo for garage details)
- Bedroom Wardrobe Slide
- Four-Seat Sofa
- Stowable Table
- Dual Entry Doors
- Residential Refrigerator
- Universal Docking Station
- Sleeps 11
- Solar & Generator
Load up your toys, gear, clothes and food to enjoy some off-road fun with your toys and friends! Once at the RV park, unload your toys, and setup the three slide outs, the two awnings, and begin planning your trail rides! You might decide to make a meal or snack in the combined kitchen and main living area which offers all the appliances you need, plus a kitchen island with an extended countertop and two bar stools, a pantry, a 49" LED TV with a fireplace below, plus a slide out four-seat sofa. The garage even offers the option to add two Happi-Jac rollover sofas and a table with a top bed if you want seating and sleeping space, plus there is storage, a prepped space to add a washer/dryer option, and an optional half bath. The overhead loft bed provides sleeping space as well. You will love the sunken tub/shower with a seat in the full bathroom with a space savings sliding door, and the front bedroom can be your escape. The queen bed is the largest bed size the floorplan can accommodate, a slide out wardrobe and USB charging outlets. If you want less garage space, take a look at 349M-R!
The Momentum M-Class fifth wheel toy haulers by Grand Design are lighter than the Momentum yet aren't lightweight on features when it comes to elegant design, luxury and a "Class" of its own! The chef-inspired kitchen provides a free-standing 3.7 cu. ft. gas range, a four burner cooktop with cast iron grill, an electronic ignition oven, and a digital display and interior oven light, plus 42,500 BTU of cooking power. The upgraded main bathroom offers solid surface counter tops, a three-jet shower panel system, a shower wand, and a teak bench seat. Each toy hauler includes a triple insulated garage floor, Tuff-Ply gas and oil resistant garage flooring, 2,500 lb. rated flush-mount tie-downs, and a Fast Ramp rear ramp door with two-sided lift-assist technology making it easy for one person to operate. And the MORryde CRE3000 suspension system and the rubber pin box, plus the upgraded axle hangers provide performance and smooth towing to your favorite destinations!
Blue Fox Rv
390 W 2500 N North Logan Utah
435-890-4602
435-317-3625
Take a look around — literally.
A short tour from our lot. We narrate the build details and the storage you can't see in photos.
All the numbers, sorted.
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Towing & Dimensions 6
Tires & Wheels 8
Cargo 4
Quick Overview 8
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VisitNorth Logan, UT 84341
Local. Honest. Built to last.
Most of our buyers come from referrals because we sweat the small stuff after the sale.
Quick answers, no sales pitch.
Is the 2022 Grand Design RV Momentum M-Class 398m still available?
Yes — as of June 24, 2026, this unit is on our lot in North Logan, UT. Last updated June 23, 2026.
How much is the 2022 Grand Design RV Momentum M-Class 398m?
$89,995. With $17,999 down at 6.99% APR over 180 months, that's about $647/mo. We accept trades — talk to us about your current unit when you visit.
What can tow this Grand Design RV Momentum M-Class?
1-ton truck with a proper heavy-duty towing package required — F-350+, Silverado 3500+, Ram 3500+. Dry weight is 15,000 lbs. Hitch/tongue weight is 2,980 lbs.
How many people can sleep in the Momentum M-Class?
11 people comfortably. Bed configuration: 1 queen, 1 bunk.
What's the warranty?
Basic warranty: 12. We'll go over all coverage details at the walkthrough before delivery.
Can I trade in my current RV?
Yes — we take trades every week, even if you don't buy from us. We'll give you a real offer once we see the RV. Call (435) 317-3625 or fill out the inquiry form below to get started.
How do I schedule a walkthrough?
Call (435) 317-3625, or fill out the inquiry form below. Same-day response during business hours.