Northeast Oklahoma's Local, Family-Owned RV Dealer

SAPULPA

TULSA

Tulsa

Sapulpa

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NEW 2026 Grand Design Momentum 399M

RETAIL:
$196,207
SALE:
$153,995

Jump to: Key Features | 360 Tour | Specs and Options | Standard Features

HIT THE ROAD AS LOW AS
$1053/mo
Estimated payment with 20% down,
8.69% APR, 240 month term

With approved credit. Not all buyers will qualify. Click below to get your terms with no affect on your credit.

GET YOUR TERMS

The Grand Design Momentum 399M fifth wheel toy hauler is engineered for uncompromising adventure and residential comfort. This premium toy hauler features a spacious 12' 6" garage, providing ample room for your toys or transforming into a multi-purpose living space. The forward area boasts a luxurious and comfortable living area with high-end finishes, ensuring you can relax in style after a day on the trails. Built with Grand Design’s signature quality, the 399M is made to last. Furthermore, it is backed by an exceptional warranty and dedicated customer support, giving you total peace of mind no matter how far off the beaten path you roam.

NEW 2026 Grand Design Momentum 399M
Hitch:
3,464 lbs.
UVW:
18,000 lbs.
Length:
44' 10"
Sleeps:
up to 6

Stock: 26-22890N   •   Location: Tulsa

KEY FEATURES

Grand Design Warranty

You can camp with confidence. Grand Design is built to a higher standard and backed by a 1-year limited, 3-year structural, and 5-year frame warranty.

 

Rockford Fosgate Sound

Enjoy your tunes the way they are meant to be heard with high quality Rockford Fosgate sound.

 

Arctic 4-Seasons Protection Package

Extend your camping season and stay comfortable in virtually any weather with Grand Design's robust 4-seasons package.

 

Compass Connect

Control lighting, slide-outs, leveling and awnings, monitor tire pressure and system status in the palm of your hand.

 

Stealth 3 AC

Stay cool in the hottest weather with the ability to run 3 15k BTU A/Cs at the same time. This unit is equipped with a third A/C.

 

Anti-lock Braking System

Towing technology designed to let you haul safer and smarter than ever before.

 
 

360 TOUR

Sorry, 360 Tour is not available for this model.

SPECS AND OPTIONS

FACTORY-ADDED OPTIONS

  • M-Class Luxury Interior Package
  • M-Class Exterior Package
  • M-Class Garage Package
  • Weather-Tek Insulation Package
  • Under Unit LED Light Kit
  • Bedroom A/C
  • 3rd A/C Prep
  • Kitchen Power Fan w/Rain Sensor
  • Garage LED HD TV
  • Auxiliary Fresh Water Tank
  • 20 Cu. Ft. 12V Refrigerator(+ Inverter Prep, 330W Solar Panel, 50 Amp Controller, Bluetooth Module and Two (2) Dock Ports)
  • OmniConnect - Satellite, Cellular and Wifi Internet Prep
  • SafeRide RV Roadside Assistance
  • RVIA Seal
  • Upgraded Cooper H-Rated Tires w/ 17.5" Wheels (Triple Axle)
  • King Bed Upgrade
  • Rockford Fosgate Stage 1 Stereo - 500 Watts, Int/Ext Speakers w/1 O" Powered Sub
  • 6K Watt Generator
  • Gen Ill 3 Season Door with Sliding Windows
  • 3rd A/C
  • Heat Pump A/C
  • Momentum Garage Suite Featuring P2K Bed Lift
  • Rear Aluminum Deck System w/Rear Power Awning
  • Momentum Patio Chairs
  • Solar + Package (One (1) Additional 330W Panel & 2000W Inverter)
  • MorRyde 7K Independent Suspension 2.0 with Disc Brakes (Triple Axle)
DOWNLOAD MSRP SHEET

SPECS

  • Exterior Height: 13' 6"
  • Exterior Height (w/opt. AC): 13' 6"
  • Exterior Length: 44' 10"
  • Exterior Width: 8' 5"
  • Interior Height: 8' 5"
  • Hitch / Pin Weight: 3,464 lbs.
  • UVW: 18,000 lbs.
  • GVWR: 22,500 lbs.
  • Fresh Water Capacity: 140 gal.
  • Gray Water Capacity: 104 gal.
  • Waste Water Capacity: 52 gal.
  • Propane Tanks: 2
  • LPG: 60
  • Sleeping Capacity: 6
  • Fuel Capacity: 60
  • Water Heater: Tankless
  • Refrigerator: 20 cu. ft.
  • Furnace: 35,000 BTU
  • AC: 30,000 BTU
  • Axles: 3
  • Tire Size: ST215/75R17.5R LRH
  • Garage Length: 12' 6"
  • Slides: 3
  • Awnings: 3
  • Awning Length: 14', 9', and 12'
 

STANDARD FEATURES AND PACKAGES

EXTERIOR & CONSTRUCTION

  • 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
  • Gen III 3 Seasons Doors (Opt)
  • 101" Wide-Body Construction
  • 5-Side Aluminum Cage Construction
  • Fully Enclosed Underbelly w/Heated Tanks and Storage

RUNNING GEAR, FRAME & CHASSIS

  • Upgraded Axle Hangers
  • Heavy Duty H-Rated Tires
  • Heavy Duty 7,000lb. Axles with ABS Drum Brakes (381MS, 395MS)
  • Heavy Duty 8,000lb. Axles with ABS Drum Brakes (351MS)
  • 17.5" H-Rated Aluminum Wheels
  • MORryde® CRE3000 Suspension System
  • Tow Assist ABS & Sway Mitigation System
  • 6-Point Hydraulic Leveling System
  • 101" Wide Body Super Chassis

INTERIOR

  • Interior 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 & APPLIANCES

  • 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/ removeable cutting board, produce strainer and glass rinser
  • Stainless Steel 20 cu. ft. Refrigerator
  • 30" Over-The-Range Microwave
  • Fireplace with Electric Heater

BEDROOM & BATHROOM

  • Under Bed Storage Area
  • Individually Switched Reading Lights Over Bed
  • Bedside 110-Volt & USB Outlets
  • 60" x 80" Queen Pillow Top Bed Mattress
  • Porcelain Toilet
  • Medicine Cabinet w/Mirrored Door
  • Undermount Lav Sink
  • One-Piece Fiberglass Shower w/Glass Door & Teak Bench Seat

ELECTRICAL, HVAC & PLUMBING

  • Solar Prep (10 gauge wiring with universal MC4 connectors)
  • 75 Amp Converter
  • 12V Battery Disconnect
  • 12v High Power Fan (Kitchen)
  • 35K BTU High Capacity Furnace
  • Stealth AC System w/ Insulated A/C Ducts
  • Attic Vent
  • High Capacity Heat Ducts
  • Exterior Spray Port (Door Side)
  • 12V Tank Heaters
  • Sewer House Storage Area
  • Whole House Water Filtration System
  • All-In-One Enclosed Utility Center

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
  • OmniConnect On-Board WiFi Ready

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
  • Partial Paint Gel Coat Fiberglass Front Cap

LUXURY 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 on 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
 
 
 

PLEASE NOTE: Descriptions, specifications, listed features, and photos are based on information available at time of posting and are subject to change without notice. Manufacturers reserve the right to change, add, or remove features without notice. Please contact your salesperson with any specific questions about features and specs of the unit you are purchasing. Camperland of Oklahoma, LLC is not responsible for typographical errors in either price or description. Any and all differences must be addressed prior to sale. All sales prices are priced without allowance for trades and do not include freight, prep, or doc fees.

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