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Momentum 399TH

Momentum 399TH Floorplan

Specs / Features / Packages


15900 lbs
Hitch Weight1
3400 lbs
20000 lbs
43' 1"
13' 5"
Axle Rating
3 X 7000
Fresh Water Capacity4
155 Gal
Grey Water Capacity
104 Gal
Waste Water Capacity
104 Gal
Water Heater
Fuel Capacity
60 Gal
LP Capacity
60 lbs
35000 BTU
5000 BTU
Frame Size
12" Main Rail I-Beam/10"Drop Rail
R-Value (Main Floor)3
R-Value (Garage Floor)3
R-Value (Walls)
R-Value (Roof)3
Aluminum Cage
Awning Length
14' & 16'
Std. Bed Dimensions
60" X 80" Queen (Opt. King)



  • Interior Color Changing LED Accent Lighting(S)
  • Raised Panel Hardwood Cabinet Doors w/Hidden Hinges(S)
  • Sofa w/Headrest & Removable Swivel Tables (Includes Heat, Massage & LED Lighting Package(S)
  • Plywood Drawer Bottoms(S)
  • Wall Mounted "No-Pedestal" Table w/4 Chairs (395M)(S)
  • Central Vacuum System w/ Tools and Dust Pan(S)
  • Super Sofa Upgrade - IPO Theatre Seats & Dinette (395M, 397TH, 399TH only)(O)


  • Full Paint Gel Coat Fiberglass Front Cap(S)
  • Full Body Paint (O)
  • Under Mount 16" Spare Tire(S)
  • Door Side Exterior Spray Port(S)
  • 6-Point Hydraulic Leveling System (S)
  • MORryde® Pin Box(S)
  • Dual Pane Window Upgrade(O)
  • Back-Up Camera (Camera Prep Standard) (O)
  • Slide-Out Awning Toppers (O)
  • Keyed Alike™ Ramp Door Latches(S)
  • 2nd Power Patio Awning w/ LED Lights (S)
  • 3rd Power Awning w/ LED Lights (Main Slide - 395M and 397TH)(M)
  • Front and Back Under Unit Blue LED Light Kit(M)
  • High-Gloss Gel Coat Exterior Sidewalls(S)


  • Microwave (S)
  • 18 Cu. Ft. Refrigerator (S)
  • Residential Kitchen Faucet(S)
  • Window Behind Range (349M, 351M, 381M, 398M, 397TH, 399TH)(S)
  • Kitchen Barstools w/ Extended Countertops (349M, 351M, 381M, 398M, 397TH, 399TH only)(S)


  • One-Piece Fiberglass Shower w/Glass Door(S)
  • Skylight Above Shower(S)
  • Porcelain Toilet(S)
  • Medicine Cabinet w/Mirrored Door(S)


  • Drop Frame Chassis (12" over 10")(S)
  • Upgraded Axle Hangers(S)
  • MORryde® CRE3000 Suspension System(S)


  • Under Bed Storage Area (N/A 376THS)(S)
  • Individually Switched Reading Lights Over Bed(S)
  • Bedside 110-Volt Outlets(S)
  • 60" X 80" Queen Memory Foam Mattress(S)
  • King Bed Upgrade(O)
  • Residential Style Headboard(S)


  • Happi-Jac Electric Bunk System w/Folding Sofas (N/A 376THS)(O)
  • Patio Steps (N/A 376THS)(O)
  • Rear Cargo Loading & Backup LED Lights(S)
  • Quick Set Ramp Door Patio System w/ Power Awning (N/A 376THS)(O)
  • 3-Season Garage Wall (NA w/ Pull Down Garage Screen Wall) (N/A 376THS)(O)

Audio & Video

  • Rockford Fosgate Speaker Package w/12" Sub and 300W Amp(O)
  • No-Crank Digital TV Antenna w/Booster(S)
  • Satellite/Solar Roof Access Channel(S)
  • 32" Class LED TV in Bedroom(S)
  • TV Prep in Garage (NA 376THS)(S)
  • Exterior Entertainment Center w/LED TV(M)


  • Solar Prep (10 gauge wiring with universal MC4 connectors)(S)
  • Solitude Solar System (300w Solar Panel, Controller, 2000w Inverter)(O)
  • OneControl™ 7" Touchscreen Control Panel w/App Controls and Redundant Slide Switches(S)
  • Generator Prep(S)
  • Onan 5.5KW Gasoline Generator(O)

HVAC & Plumbing

  • 12v High Power Fan (Kitchen)(S)
  • 12v High Power Fan - Master Bath (S)
  • 12V Tank Heaters (All Tanks)(S)
  • 35k BTU High Capacity Furnace(S)
  • Fireplace w/ 5,000 BTU Electric Heater(S)
  • 15k BTU A/C - Middle/Main(S)
  • 2nd 15k BTU A/C - Bedroom (M)
  • 3rd 15k BTU A/C(O)
  • Heat Pump A/C - Living Area(O)



  • Satellite TV Prep (All TV Locations)
  • Aluminum Quad Entry Steps - Garage Entry (N/A 376THS)
  • 7,000 lb. Axles w/Self Adjusting Brakes, Wet Bolts and Bronze Bushings
  • 16” Aluminum Wheels (120PSI Rated)
  • West Lake® G-Rated Tires w/NitroFill™
  • Slam-Latch Baggage Doors
  • Frameless Tinted Windows
  • Aluminum Quad Entry Steps - Main Entry
  • 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 328M and 376THS)
  • Full Paint Gel Coat Fiberglass Front Cap (376TH, 397TH, 399TH only)
  • Solid Step Quad Entry Step - Main Entry


  • 32" Class LED TV in Garage (397TH and 399TH only)
  • Protective Diamond Plate on Garage Sidewalls
  • 2,500 lb. Rated Flush-Mount Tie-Downs
  • Ram-Air Garage Vents Both Sides(N/A 376THS)
  • Tuff-Ply Gas and Oil Resistant Garage Flooring
  • Fast Ramp Rear Ramp Door(N/A 376THS)
  • Triple Insulated Garage Floor (N/A 376THS)


  • 49" Class LED TV in Living Area
  • Stereo Entertainment System w/Bluetooth and App Based Controls in Living Area
  • Washer/Dryer Prep
  • 12 Gallon Gas/Electric 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 (N/A 376THS)


  • 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

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Because of our commitment to continuous product improvement, Grand Design RV reserves the right to change components, standards, options, specifications, pricing and materials without notice and at any time. Photos may show optional equipment which may not be included in the standard purchase price of the featured unit. Be sure to review current product details with your local dealer before purchasing.