Contact Sales

New 2025 Grand Design Momentum M-Class 398M

Toy Hauler Fifth Wheel

Stock #69942

Bakersfield

1 of 9

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.

Options:

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

Call Today 661-247-4549

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.

Favorite RVs

Save your favorite RVs as you browse. Begin with this one!

Happy Daze is our go-to dealer
In 2011, we purchased our first travel trailer , a 2011 Cruiser RV Fun FinderX, at one of your shows. We just went looking and walked away with a 24' foot home away from home. Our experience at that time was very positive, from the salesperson through the finance office, from the person who did our ... More »

Lori
Very Impressed
" We didn't have good luck from the day that we purchased our 5th wheel from "another" dealership, items were missed, parts never ordered, we never got results...so we gave up, we contacted Keystone to see where else we could go, they told us about Happy Daze. We have to say from the minute we walked ... More »

Anonymous
Great 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 »

Mike from Woodland, CA

We are here to help, call us at
661-247-4549 or Contact Us

We are here to help!

661-247-4549
Contact Us
Contact Sales

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.

New 2025 Grand Design Momentum M-Class 398M

398M Floorplan

Specifications

Description

Features

Connect with us!