Toy hauler, side patio, bath and a half, bar seating
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2025 Grand Design Momentum 399TH
UsedStock #118049R
Listing price
2025 Momentum 399TH
Other floor plans with a similar body style, feature mix, and price range, prioritizing other manufacturers and brands.
Grand Design's Momentum 399TH is a toy hauler that doesn't feel like one once you're inside. The side patio creates an outdoor living area that's genuinely usable, not just a bonus feature, and the apartment-like interior backs that up with a kitchen island, bar seating, and a north/south bed in the front bedroom. The 13-foot garage handles serious gear, and the R40 triple-insulated floor means it's built for more than fair-weather camping. Bath and a half keeps things practical when you've got a full crew, and Grand Design's reputation for fit and finish shows throughout.
Length
43 ft 9 in
Dry weight
15,900 lbs
GVWR
20,000 lbs
Sleeps
9
Many factors play into a unit's listing price and what you should pay. This guide provides a ballpark estimate, but it does not factor in your exact scenario or how different listings are equipped.
There may be room for price negotiation.
$52,999 – $110,985
This unit has been on the lot for 61 to 90 days.
This unit is ranked 14 of 14 by asking price in this group.
The listing price on this unit has changed 2 times.
See the complete price timeline and the rest of this unit's pricing insights.
Campers Inn RV
Knoxville, TN
Sells slower than 89% of US RV dealers
Compared with 1,116 dealers nationwide
The Used 2025 Grand Design Momentum 399M is built for serious toy-hauling adventures while giving you a comfortable place to settle in once the toys are unloaded. The spacious garage provides room for your motorcycles, ATVs, or other gear, with a rear ramp door making loading and unloading convenient. The garage also offers flexible living space, while the side patio creates an elevated outdoor area for relaxing and entertaining. Moving into the main living area, the open layout features comfortable seating, a spacious kitchen with a large island, generous countertop space, residential-style appliances, and plenty of cabinetry. The entertainment area gives you a great place to unwind, while the large windows help keep the living space bright and open.
The front bedroom provides a private retreat with a Queen bed, ample wardrobe storage, dresser space, and convenient access to the main bathroom. The spacious bathroom features a large shower and residential-inspired amenities, while the additional half bath adds convenience when you're entertaining or traveling with guests. The 399M also provides plenty of storage throughout, along with thoughtful toy-hauler features designed for extended trips. With its combination of a large garage, flexible indoor and outdoor living areas, residential-style kitchen, private bedroom, and bath-and-a-half layout, the Momentum 399M is an excellent choice for buyers who want a toy hauler that can handle the adventure without giving up comfort.
Spacious Toy Hauler Garage
Rear Ramp Door
Side Patio
Spacious Kitchen Island
Residential-Style Kitchen
Large Main Living Area
Private Front Bedroom
Queen Bed
Large Bathroom With Spacious Shower
Generous Storage Throughout
Multiple Entertainment Areas
Flexible Garage Living Space
Residential-Inspired Interior
At Campers Inn RV, we're here to help you find an RV that fits the way you actually want to travel. Our RV Match Makers and product specialists can help you compare floorplans, features, and options so you can find the right fit for your adventures. From financing assistance and parts and accessories to professional RV service and support after the sale, we're here to be your RV resource throughout the ownership experience. Whether you're hauling toys for weekend adventures, planning extended trips, or looking for a comfortable RV that gives you room to entertain, our team is here to help make the entire process easier.
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Call or text 865-933-7213 today to learn more about this Used 2025 Grand Design Momentum 399M.
