New 2019 Grand Design Momentum 399TH
All of our Grand Design RVs come with a Utah Exclusive RV Warranty Forever - Nationwide
Stock# MOM3863
Interior Color: WHITE
Sleeps | 7 |
Slides | 3 |
Length | 43 ft 4 in |
Ext Width | 8 ft 5 in |
Ext Height | 13 ft 5 in |
Interior Color | WHITE |
Hitch Weight | 3400 lbs |
Gross Weight | 20000 lbs |
Dry Weight | 15900 lbs |
Fresh Water Capacity | 157 gals |
Grey Water Capacity | 104 gals |
Black Water Capacity | 104 gals |
Tire Size | 16" |
Furnace BTU | 40000 btu |
Fuel Capacity | 60 gals |
Number Of Bunks | 1 |
Available Beds | Queen |
Refrigerator Type | Four Door |
Refrigerator Size | 18 cu ft |
Convection Cooking | Yes |
Cooktop Burners | 3 |
Number of Awnings | 2 |
Axle Weight | 7000 lbs |
Garage Size | 13 ft |
LP Tank Capacity | 30 |
Water Heater Capacity | 12 gal |
Water Heater Type | Gas/Electric |
AC BTU | 43500 btu |
TV Info | LR 49" LED, BR 32" LED, Garage 32" LED, Ext. LED |
Awning Info | 14' & 16' Power |
Axle Count | 3 |
Washer/Dryer Available | Yes |
Number of LP Tanks | 2 |
Shower Type | Shower w/Seat |
Electrical Service | 50 amp |
VIN | 573FM45371113863 |
- 13' Garage
- Fold-Down Side Patio
- Dual Entry
- Bath and a Half
- Kitchen Island
- Fireplace
- Exterior LED TV
- Dual Enclosed Fuel Station
- Spray Port
If you are ready to play with your off-road toys, hitch up this Momentum 399TH fifth wheel toy hauler after loading your toys in the 13' garage. You will be able to get cleaned up after getting muddy from the trails in the half bath in the garage or the full bathroom next to the bedroom. The kids can sit on the bar stools at the kitchen island, or relax on the dinette and theater seats while watching the 49" LED TV and fireplace. There are several options to choose from, and many more features to enjoy such as the dual entry doors, fold-down side patio with LED TV, and exterior unobstructed pass-through storage, plus more!
With any Momentum toy hauler fifth wheel you will enjoy extraordinary living with extreme playtime with the Weather-Tek insulation for four seasons of protection, and a fully enclosed fuel pump station to keep the fun going the whole time. The Tuff-Ply garage flooring is gas and oil resistant, plus triple insulated. You will find 2,500 lb. rated flush-mount tie-downs to keep your toys secure while moving down the road. The interior includes a sofa with headrest and removable swivel table, a convection microwave, a central vacuum system with tools and a dust pan, and a satellite/solar roof access channel to mention a few highlights. Any Grand Design Momentum allows you to keep your active lifestyle no matter where you decide to stay!
Thanks Dan Walters for our trailer, we love it. there was nothing here in cedar city to even look at. Wow, i was surprised how much pre-owned inventory you guys had. just thought i would shoot a quick thank you. - daniel from UT



Sleeps | 7 |
Slides | 3 |
Length | 43 ft 4 in |
Ext Width | 8 ft 5 in |
Ext Height | 13 ft 5 in |
Interior Color | WHITE |
Hitch Weight | 3400 lbs |
Gross Weight | 20000 lbs |
Dry Weight | 15900 lbs |
Fresh Water Capacity | 157 gals |
Grey Water Capacity | 104 gals |
Black Water Capacity | 104 gals |
Tire Size | 16" |
Furnace BTU | 40000 btu |
Fuel Capacity | 60 gals |
Number Of Bunks | 1 |
Available Beds | Queen |
Refrigerator Type | Four Door |
Refrigerator Size | 18 cu ft |
Convection Cooking | Yes |
Cooktop Burners | 3 |
Number of Awnings | 2 |
Axle Weight | 7000 lbs |
Garage Size | 13 ft |
LP Tank Capacity | 30 |
Water Heater Capacity | 12 gal |
Water Heater Type | Gas/Electric |
AC BTU | 43500 btu |
TV Info | LR 49" LED, BR 32" LED, Garage 32" LED, Ext. LED |
Awning Info | 14' & 16' Power |
Axle Count | 3 |
Washer/Dryer Available | Yes |
Number of LP Tanks | 2 |
Shower Type | Shower w/Seat |
Electrical Service | 50 amp |

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PAYMENTS ARE ESTIMATES WITH 20% DOWN PAYMENT.
BASED ON APPROVED CREDIT PLUS TAX, TITLE AND LICENSE FEES OF SELLING PRICE.
NOT ALL CUSTOMERS WILL QUALIFY FOR THESE RATES AND TERMS.
*ON THE AMOUNT FINANCED UNDER $24,999 TERMS ARE BASED ON 144 MONTHS AT 6.99%
*ON THE AMOUNT FINANCED FROM $25,000 TO $49,999 TERMS ARE BASED ON 180 MONTHS AT 6.99%
*ON THE AMOUNT FINANCED OF $50,000 OR MORE TERMS ARE BASED ON 240 MONTHS AT 6.99%
Nielson RV is not responsible for pricing errors, typos, or incorrect information on our website. Manufacturer and/or stock photographs, floor plans, and specifications may be used. Prices listed include dealer preparation, walk through orientation, and factory freight. Prices exclude sales tax, license fee, documentary fee, and state inspection fee. Any calculated payment information is an estimate only and does not constitute a guarantee that financing or a specific rate or term is available. Units are subject to prior sale until a buyers order is submitted and a deposit made. Please verify unit availability by calling 435-652-1111 as our inventory changes rapidly.