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New 2023 Grand Design Momentum 399TH

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Call Today 209-924-4022
2023 399TH Features and Options
Grand Design Momentum fifth wheel toy hauler 399TH highlights:
  • Fold-Down Side Patio
  • 13' Garage
  • Bath and a Half
  • Dual Entry
  • Island with Bar Stools
  • 60 Gallon Fuel Tank

 

Get ready for a lot of fun when you head out to the off-road park, a special event, or a long trip with your toys! You will love the garage with the Fast Ramp rear ramp door, the Ram-Air garage vents on both sides, the 2,500 lb. rated flush-mount tie-downs and the protective diamond plate on the garage sidewalls. This area can become a bedroom or an extra living area if you want to add Happi-Jac rollover sofas/table with top bed option, plus you will already have a half bath for convenience, an LED TV and storage for your gear. The living and kitchen area is spacious with dual slides and a kitchen island with bar stools, a free standing table and theatre seating or choose the super sofa option, and everything you need to feed everyone. And the fold-down side patio offers an LED TV, storage and a great place to relax outdoors above ground. There are many more features to enjoy, and several options to customize your fifth wheel. And if you would prefer to have a residential refrigerator, you should check out model 399TH-R!

 

The Momentum fifth wheel toy haulers by Grand Design are built for four seasons of travel with your off-road toys and include luxurious accommodations throughout for extreme living! Each is constructed to a superior standard with the thermal roof design, the full-laminated walls, the triple insulated garage floor in most toy haulers, the insulated gooseneck and the Rail-Tite underbelly seat. The MORryde CRE3000 suspension system and rubber pin box, plus the upgraded axle hangers provide the performance and smooth towing you desire, while the interior offers luxury such as color changing LED accent lighting, raised panel hardwood cabinet doors with hidden hinges, a sofa with headrest and removable swivel tables which include heat, massage and LED lighting package, and a central vacuum system with tools and dust pan. Start your extreme playtime now with a Momentum!      

Options:
  • 18 CUFT REFRIGERATOR
  • 3RD A/C
  • 3RD A/C PREP
  • 7K AXLE W/ABS BRAKES
  • AUX FRESH WATER TANK
  • BEDROOM A/C
  • EXT ENTERTAINMENT CENTER
  • GEN II 3 SEASON DOOR WITH SLIDING WINDOWS
  • GENERATOR-ONAN 5.5KW GAS
  • HAPPI-JAC ELECTRIC BUNK SYSTEM
  • HEAT PUMP A/C
  • KING BED UPGRADE
  • MOMENTUM EXTERIOR PACKAGE
  • MOMENTUM GARAGE PACKAGE
  • MOMENTUM INTERIOR PACKAGE
  • MOMENTUM PATIO CHAIRS
  • REAR ALUMINUM DECK SYSTEM
  • ROCKFORD FOSGATE SPEAKER UPGRADE
  • RVIA SEAL
  • SAFERIDE RV ROADSIDE ASSISTANCE
  • SOLAR PREP
  • SOLAR½ PACKAGE
  • UNDER UNIT LED LIGHT KIT
  • UPGRADED COOPER H-RATED TIRES
  • WASHINGTON STATE SEAL
  • WEATHER-TEK INSULATION PACKAGE
What Our Customers Are Saying

I am truly appreciative for what they did for us.

I have never in my life received this level of service anywhere and am extremely thankful for how quickly they diagnosed the problem and how quickly Cheryl worked around not having that exact HWH hose in stock. (I have to say the new hose is nearly indestructible and may at some time have all the hoses redone to match to ensure we don't have any other issues). I am in the service business as well - Anonymous
 
Location: Ripon
Stock# 68689
2023 399TH Specifications
Sleeps 3
Slides 3
Length 43 ft 1 in
Ext Height 13 ft 5 in
Interior Color SILVER MAPLE
Hitch Weight 3400 lbs
GVWR 20000 lbs
Dry Weight 15900 lbs
Fresh Water Capacity 140 gals
Grey Water Capacity 104 gals
Black Water Capacity 104 gals
Tire Size 17"
Furnace BTU 40000 btu
Fuel Capacity 60 gals
Available Beds Queen
Refrigerator Size 18 cu ft
Cooktop Burners 3
Number of Awnings 2
Axle Weight 7000 lbs
Garage Size 13 ft
LP Tank Capacity 60 lbs
Water Heater Capacity 12 gal
Water Heater Type Gas/Electric
TV Info LR 49" LED TV, BR 32" LED TV, Garage 32" LED TV, Ext. LED TV
Awning Info 14' & 16' Power w/LED Lights
Axle Count 3
Washer/Dryer Available Yes
Shower Type Sunken Tub/Shower
Electrical Service 50 amp
VIN 573FM4537P1124174
For more information, call us at 209-924-4022 or Contact Us
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ManuFacts
Grand Design Logo
In 2012, we started with a blank canvas to pursue that better way, a different way, than what had been done before. A company whose culture requires a long-term, personal connection with our customers, employees, and dealers – that company is Grand Design RV. Our business model of doing the right thing has led us to unparalleled years of growth.
 
Our local workforce has been hand-picked and has an excellent reputation for second-to-none industry craftsmanship, and our CEO and Senior Management actively work with the production facilities to help build the team and develop products.
 
At Grand Design we've raised the quality bar by putting every unit through a series of quality inspection gates during the manufacturing process. Once completed, the unit undergoes a comprehensive “final finish” inspection. Every one of our coaches is shipped to a PDI (Pre-Delivery Inspection) area where they are put through a rigorous 300+ point inspection checklist before being shipped to our dealers.  And, we back every one of our coaches with a 3-year limited structural warranty.  
 
At Grand Design our goal is simple – continue leading the industry with quality products while improving the customer’s RV experience before, during and after the sale. We strive for nothing less than customers for life and we would be honored to personally welcome you to the Grand Design RV family!

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.