Front bedroom, rear living area, bunk beds, mid bunk
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2025 Grand Design Solitude 378MBS
UsedStock #33617A
Listing price
2025 Solitude 378MBS
Other floor plans with a similar body style, feature mix, and price range, prioritizing other manufacturers and brands.
What makes the 378MBS interesting is its layout logic: the living room lives in the rear slide, giving it a true room-like feel, while the east/west bed up front stays well away from the noise. The mid-bunk section is legitimately versatile. Owners have used it as an office, guest space, or actual bunk room depending on the trip. Grand Design builds the Solitude line with thicker walls and more insulation than most competitors, and the 378MBS adds CRE 3000 suspension and auto-leveling to help manage what is a substantial rig to tow. A kitchen island, desk, fireplace, and washer/dryer prep mean this one is set up for extended stays, not just weekends.
Length
40 ft 2 in
Dry weight
14,344 lbs
GVWR
18,000 lbs
Sleeps
7
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.
$38,995 – $85,399
This unit is ranked 15 of 17 by asking price in this group.
Crestview RV
Buda, TX
Sells faster than 57% of Texas RV dealers
Compared with 230 dealers in Texas
Grand Design Solitude fifth wheel 378MBS highlights:
Middle Bunkhouse/Office
Kitchen Island
Free Standing Dinette
Outside Beverage Cooler & Griddle
Two Power Awnings
The middle bunkhouse in this fifth wheel includes a fold down bunk above a tri-fold sofa which offers seating for extra living space as well as sleeping space for a bedroom. There is also a desk to work from and a closet for clothing and supplies making this room multi-functional. The front master bedroom features a queen bed slide or you can choose the king option, and a large closet as well as a washer/dryer prep. The main combined living and kitchen area is spacious with dual opposing slides and offers theatre seating and a tri-fold sofa to relax on while watching the LED Smart TV allowing you to visit with the cook in the kitchen while preparing meals. This chef kitchen offers an island with prep space and a sink, a built-in oven, a 20 cu. ft. refrigerator, and an oversized pantry to store lots of dry goods and snacks. You will surely enjoy the two power awnings and the outside griddle plus beverage cooler while relaxing outdoors.
Each Solitude fifth wheel by Grand Design features a 101" wide-body construction, heavy duty 8,000 lb. axles, frameless tinted windows, and high-gloss gel coat sidewalls. You can camp year around thanks to the Weather-Tek Package that includes a 35K BTU high-capacity furnace, an all-in-one enclosed and heated utility center, and a fully enclosed underbelly with heated tanks and storage. Inside, you'll love the premium roller shades, hardwood cabinet doors, solid surface countertops, plus residential finishes throughout to make you truly feel at home. Each model also includes a MORryde CRE3000 suspension system, self adjusting brakes, and a MORryde pin box that will provide smooth towing from home to campground. Affordable luxury is possible with the Solitude fifth wheels; choose yours today!
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