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Image #1 - New 2025 Grand Design Momentum M-Class 398M Toy Hauler Fifth Wheel - Stock #69942
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Image #2 - New 2025 Grand Design Momentum M-Class 398M Toy Hauler Fifth Wheel - Stock #69942 - Floorplan
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Image #3 - New 2025 Grand Design Momentum M-Class 398M Toy Hauler Fifth Wheel - Stock #69942
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Image #4 - New 2025 Grand Design Momentum M-Class 398M Toy Hauler Fifth Wheel - Stock #69942
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Image #5 - New 2025 Grand Design Momentum M-Class 398M Toy Hauler Fifth Wheel - Stock #69942
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Image #6 - New 2025 Grand Design Momentum M-Class 398M Toy Hauler Fifth Wheel - Stock #69942
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Image #7 - New 2025 Grand Design Momentum M-Class 398M Toy Hauler Fifth Wheel - Stock #69942
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Image #8 - New 2025 Grand Design Momentum M-Class 398M Toy Hauler Fifth Wheel - Stock #69942
+8
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44ft long
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15,000 lbs
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Sleeps 8
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3 slides
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Kitchen IslandLoft
398M Floorplan
Specifications
| Sleeps | 8 | Slides | 3 |
| Length | 43 ft 10 in | Ext Width | 8 ft 5 in |
| Ext Height | 13 ft 5 in | Int Height | 8 ft 5 in |
| Interior Color | MAGNOLIA | Hitch Weight | 2980 lbs |
| GVWR | 20000 lbs | Dry Weight | 15000 lbs |
| Fresh Water Capacity | 140 gals | Grey Water Capacity | 52 gals |
| Black Water Capacity | 52 gals | Tire Size | ST215/75R17.5 LRH |
| Furnace BTU | 35000 btu | Fuel Capacity | 60 gals |
| Number Of Bunks | 1 | Available Beds | Queen |
| Refrigerator Type | Stainless Steel | Refrigerator Size | 20 cu ft |
| Cooktop Burners | 3 | Number of Awnings | 2 |
| Axle Weight | 7000 lbs | Garage Size | 18 ft |
| LP Tank Capacity | 30 lbs | Water Heater Type | On Demand |
| AC BTU | 30000 btu | TV Info | LED TV; LR 49", Garage 32" |
| Awning Info | 16' and 18' Power with LED Lights | Axle Count | 3 |
| Washer/Dryer Available | Yes | Number of LP Tanks | 2 |
| Shower Type | Shower w/Seat | Electrical Service | 50 amp |
| VIN | 573FM4635SBB03053 |
Description
Grand Design Momentum M-Class toy hauler 398M highlights:
- 18' Separate Garage
- Bedroom Wardrobe Slide
- Four-Seat Super Sofa
- Kitchen Island with Bar Stools
- Dual Entry Doors
- Flip Up Pet Dish
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 set up the three slide outs and 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 two bar stools, a pantry, an LED TV with a fireplace below, plus a slide out four-seat sofa. The garage even offers sofas and an overhead bed plus the option to add two additional Happi-Jac rollover sofas with tables with a top bed if you want seating and sleeping space. The overhead loft bed provides sleeping space as well. You will love the shower with a seat in the full bathroom with a space saving sliding door, and the front bedroom can be your escape. There is a queen bed, a slide out wardrobe and USB charging outlets.
With any Momentum M-Class toy hauler by Grand Design, you will enjoy luxury at every turn! They have been constructed to a superior standard with a thermal roof design, triple insulated main floor and garage floor, and a Rail-Tite underbelly seal that will allow you to camp in all elements. Each model also features an 8' 5" wide body chassis with a wide rail design, no wheel wheels, and a dovetail entry for easier loading. The Stealth A/C system provides maximum cooling power, and the CRE3000 suspension system means you can enjoy a smooth tow each time. You will love the luxurious interior with a professional grade stainless steel cooktop, interior color changing LED accent lighting, a fiberglass shower with a glass door, and solid surface countertops.
- 20 CU FT 12V REFRIGERATOR
- 3RD A/C
- 3RD A/C PREP
- 7K AXLE W/ABS DRUM BRAKES
- AUXILLARY FRESH WATER TANK
- BEDROOM A/C
- EXTERIOR ENTERTAINMENT CENTER
- EXTERIOR PKG
- GARAGE LED HD TV
- GARAGE PKG
- GEN II 3 SEASON DOOR
- HAPPI-JAC ELECTRIC BUNK
- HEAT PUMP A/C
- KITCHEN POWER FAN W/ RAIN S
- LUXURY INTERIOR PKG
- MOMENTUM PATIO CHAIRS
- REAR ALUMINUM DECK SYSTEM
- ROCKFORD FOSGATE STG 1
- RVIA SEAL
- SAFERIDE RV ROADSITE
- SOLAR ½ PKG
- TRAVLFI ON-BOARD WIFI
- UNDER UNIT LED LIGHT KIT
- UPGRADED COOPER H RATED TIRES
- WEATHER-TEK INSULATION PKG
- YAMAHA GENERATOR
Features
Standard Features (2025)
Exterior
- Keyed Alike™ Ramp Door Latches
- 2nd Patio Awning w/ LED Lights
- 3rd Awning w/LED Lights (Main Slide-395MS)
- Exterior Color Changing LED Accent Lighting
- 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 Secure
Construction
- 101" Wide-Body Construction
- 5-Side Aluminum Cage Construction
- Fully Enclosed Underbelly w/Heated Tanks and Storage
Running Gear
- Upgraded Axle Hangers
- Heavy Duty H-Rated Tires
- Heavy Duty 7,000lb. Axles with ABS Drum Brakes (381MS, 395MS)
- Heavy Duty 8,000lbs. Axles with ABS Drum Brakes (351MS)
- 17.5" H-Rated Aluminum Wheels
- MORryde® CRE3000 Suspension System
- Tow Assist ABS & Sway Mitigation System
Frame & Chassis
- 6-Point Hydraulic Leveling System
- 101" Wide Body Super Chassis
Interior
- Interior Color Changing LED Accent Lighting
- Hardwood Cabinet Doors w/Hidden Hinges
- Recliner Sofa w/Adjustable Headrest or Flip Down Cupholders
- Central Vacuum System w/ Tools and Dust Pan
- Plywood Drawer Bottoms
Kitchen
- Microwave
- Residential Kitchen Faucet
- Professional Grade Stainless Steel Cooktop
- 12v High Power MaxxAir Fan with Rain Sensor
- Window Behind Range (N/A 395MS)
- Kitchen Barstools w/Extended Countertops (351MS, 381MS)
- Smart Sink w/removable cutting board, produce strainer and glass rinser
Electrical
- Solar Prep (10 gauge wiring with universal MC4 connectors)
- 75 Amp Converter
- 12V Battery Disconnect
HVAC
- 12v High Power Fan (Kitchen)
- 35K BTU High Capacity Furnace
- Stealth AC System w/ Insulated A/C Ducts
- Attic Vent
- High Capacity Heat Ducts
Plumbing
- Exterior Spray Port (Door Side)
- 12V Tank Heaters
- Sewer House Storage Area
- Whole House Water Filtration System
- All-In-One Enclosed Utility Center
Bedroom
- Under Bed Storage Area
- Individually Switched Reading Lights Over Bed
- Bedside 110-Volt & USB Outlets
- Window Above Master Bed Headboard
- 60" x 80" Queen Pillow Top Bed Mattress
Bathroom
- Porcelain Toilet
- Medicine Cabinet w/Mirrored Door
- Undermount Lav Sink
- One-Piece Fiberglass Shower w/Glass Door & Teak Bench Seat
Appliance
- Fireplace with Electric Heater
- Stainless Steel 20 cu. ft. Refrigerator
- 30" Over-The-Range Microwave
Electronics
- Exterior Cable/SAT Plug-In
- LED Smart TV in Living Area
- Rockford Fosgate Stereo Ent. System w/HDMI and App Controls
- Exterior Speakers
- No-Crank Digital TV Antenna w/Booster
- LED TV in Garage (NA 336M)
- TravLFi On-Board WiFi Ready
Packages
Exterior Package
- Satellite TV Prep
- MORryde Strut Assist Entry Step
- Aluminum Quad Entry Steps - Garage Entry
- 7,000 lb. Axles w/Self Adjusting Brakes, Wet Bolts and Bronze Bushings
- 17” Aluminum Wheels (120PSI Rated)
- Cooper Tires® 17.5" All-Steel H-Rated Tires
- Slam-Latch Baggage Doors
- Frameless Tinted Windows
- Exterior Security Lights
- Power Patio Awning w/LED Lighting
- Folding Roof Ladder
- White Gel Coat Fiberglass Front Cap
- 12V Battery Disconnect
- All-In-One Exterior Utility Center
- 50 Amp Service
- Converter
- Enclosed Fuel Station w/ Dual Fuel Tank (Single Tank 336M)
- Partial Paint Gel Coat Fiberglass Front Cap
Interior Package
- 49" Class LED TV in Living Area
- Stereo Entertainment System w/Bluetooth and App Based Controls in Living Area
- Washer/Dryer Prep
- On Demand Water Heater
- Roller Shade Window Coverings (Main Living Area and Bedroom)
- Recessed LED Puck Lighting
- Solid Surface Countertops w/ Sink Covers
- Stainless Steel Undermount Kitchen Sink
- Chef Inspired Range & Oven w/ Cover
- Kitchen Pantry w/ LED Light Strip
- Garage Control Panel
Garage Package
- 32" Class LED TV in Garage
- Protective Diamond Plate on Garage Sidewalls
- 2,500 lb. Rated Flush-Mount Tie-Downs
- Ram-Air Garage Vents Both Sides
- Tuff-Ply Gas and Oil Resistant Garage Flooring
- FastRamp Rear Ramp Door
- Triple Insulated Garage Floor
Weather-Tek Package
- R-Value Equivalent (R-40 Roof / R-45 Floor / R-11 Sidewalls / R-40 Garage Floor / R-24 Slideroom Floor)
- Fully Enclosed and Heated, Underbelly and Storage Area
- Enclosed and Heated Low Point Drains
- Engineered Underbelly Airflow Heat Paths
- Stealth AC System w/ Insulated A/C Ducts
- Attic Vent
- Plumbing Line Insulation Barrier
See us for a complete list of features and available options!
All standard features and specifications are subject to change.
All warranty info is typically reserved for new units and is subject to specific terms and conditions. See us for more details.
Due to the current environment, our features and options are subject to change due to material availability.
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AaronExcellent experience
"Buying a travel trailer from Happy Daze has been one of my smoothest, hassle free transactions for an RV to date. My sales rep Dan Risk was an excellent communicator and did his best to answer all my questions. He really came across as an advocate for me the customer and really got me locked into buying ... More » -
Mike from Woodland, CAGreat Job Service
I had dropped my 5th wheel for my first check-up. Did the walk around with Casey Tulloh who was very gracious with us and made time for us to complete all the warrant things that needed to be addressed. She then reviewed the work sheet and gave us our copy so that we both had the exact sheet. They had ... More » -
FredPleased with our selection
"We originally set out on a mission to purchase a used trailer. After visiting several different locations to review different makes, models, and price options, we stopped in at Happy Daze. Ruben Ayala greeted us with an extremely friendly, no-pressure approach and showed us his used inventory. Of course, ... More »
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Happy Daze RV is not responsible for any misprints, typos, or errors found in our website pages. Any price listed excludes sales taxes, registration, tags and delivery fees. Manufacture pictures, specifications, and features may be used in place of actual units on our lot. To preserve the quality and mileage of our coaches, we only do test drives with a qualified offer to purchase.
