Grand Design Solitude 388MBS
Fifth wheelbuilt 2025–26Better build tierPatient search on the used market
WHAT ONE COSTS
$129,800est. used (2026, 1 yr old)
Sticker was $180,240 in 2027. Out of production since 2026, so the used market is the only way to buy one. Estimate assumes a 2026 unit.
WHAT IT WEIGHS BEHIND YOUR TRUCK
~16,892 lbestimated as towed, for 2 people
dry weight 15,400 lb + fresh water (83 gal, full) 692 lb + propane + battery 200 lb + gear for 2 600 lb. Brochure dry weight omits water, propane, batteries and your gear; this estimate doesn't.
You want a tow rating around18,770 lb (10% margin)
GVWR (the sticker maximum)19,000 lb
Tongue weight, loaded~3,071 lb (18%)
WHICH TOW VEHICLES IT FITS: 14 OF 95
Judged the way the app judges: estimated loaded weight against each vehicle's rating less a 10% margin, per model year, because the 388MBS's published weights held steady. Fifth wheels also need a pickup bed and are held to the fifth-wheel rating where published.
The 81it doesn't fit
- Chevrolet Colorado / GMC Canyon (2.7 Turbo HO, tow pkg) '23-26: over by ~9,962 lb loaded
- Chevrolet Colorado / GMC Canyon (2.8 Duramax) '15-22: over by ~9,962 lb loaded
- Chevrolet Silverado / GMC Sierra 1500 (6.2 V8, max tow) '19-26: over by ~7,622 lb loaded
- Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '20-23: over by ~232 lb loaded
- Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '11-19: over by ~602 lb loaded
- Chevrolet Silverado 1500 (max tow) '14-18: over by ~6,452 lb loaded
- Chevrolet Silverado EV (4WT) '24-26: over by ~5,642 lb loaded
- Chevrolet Suburban (5.3 V8, max tow) '21-26: no pickup bed (cannot hitch a fifth wheel)
- Chevrolet Tahoe (5.3 V8, max tow) '21-26: no pickup bed (cannot hitch a fifth wheel)
- Chevrolet Traverse (tow pkg) '18-26: no pickup bed (cannot hitch a fifth wheel)
- Chrysler Pacifica '17-26: no pickup bed (cannot hitch a fifth wheel)
- Dodge Durango (5.7 / 6.4 Hemi, tow pkg) '14-26: no pickup bed (cannot hitch a fifth wheel)
- Ford Bronco 4-dr (2.7 EcoBoost, tow pkg) '21-26: no pickup bed (cannot hitch a fifth wheel)
- Ford Expedition (3.5 EcoBoost, tow pkg) '25-26: no pickup bed (cannot hitch a fifth wheel)
- Ford Expedition (3.5 EcoBoost, tow pkg) '18-24: no pickup bed (cannot hitch a fifth wheel)
- Ford Explorer (3.0 EcoBoost, tow pkg) '20-26: no pickup bed (cannot hitch a fifth wheel)
- Ford F-150 (3.5 EcoBoost, max tow) '24-26: over by ~7,172 lb loaded
- Ford F-150 (3.5 EcoBoost, max tow) '15-20: over by ~6,182 lb loaded
- Ford F-150 (3.5 EcoBoost, max tow) '21-23: over by ~4,292 lb loaded
- Ford F-150 (3.5 EcoBoost, max tow) '11-14: over by ~6,722 lb loaded
- Ford F-150 Lightning (max trailer tow) '22-26: over by ~7,892 lb loaded
- Ford F-250 Super Duty (6.7 diesel, tow pkg) '17-19: over by ~692 lb loaded
- Ford F-250 Super Duty (6.7 diesel) '11-16: over by ~1,952 lb loaded
- Ford Maverick (2.0 EcoBoost, 4K tow pkg) '22-26: over by ~13,292 lb loaded
- Ford Ranger (2.3 EcoBoost, tow pkg) '19-23: over by ~10,142 lb loaded
- Ford Ranger (2.7 EcoBoost, tow pkg) '24-26: over by ~10,142 lb loaded
- Ford Transit (HD tow pkg) '15-26: no pickup bed (cannot hitch a fifth wheel)
- GMC Acadia (tow pkg) '20-26: no pickup bed (cannot hitch a fifth wheel)
- GMC Hummer EV Pickup '22-26: over by ~10,142 lb loaded
- GMC Sierra EV '24-26: over by ~6,092 lb loaded
- GMC Yukon / Yukon XL (5.3 V8, max tow) '21-26: no pickup bed (cannot hitch a fifth wheel)
- Honda Odyssey '18-26: no pickup bed (cannot hitch a fifth wheel)
- Honda Passport (AWD) '19-26: no pickup bed (cannot hitch a fifth wheel)
- Honda Pilot (AWD, tow pkg) '16-26: no pickup bed (cannot hitch a fifth wheel)
- Honda Ridgeline (AWD) '17-26: over by ~12,392 lb loaded
- Hyundai Palisade (tow pkg) '20-26: no pickup bed (cannot hitch a fifth wheel)
- Hyundai Santa Cruz (2.5T AWD) '22-26: over by ~12,392 lb loaded
- Jeep Gladiator (3.6 V6, max tow) '20-26: over by ~9,962 lb loaded
- Jeep Grand Cherokee (5.7 Hemi) '11-21: no pickup bed (cannot hitch a fifth wheel)
- Jeep Grand Cherokee (WL, tow pkg) '22-26: no pickup bed (cannot hitch a fifth wheel)
- Jeep Grand Cherokee L (5.7 Hemi) '21-26: no pickup bed (cannot hitch a fifth wheel)
- Jeep Grand Wagoneer (Hurricane, max tow) '22-26: no pickup bed (cannot hitch a fifth wheel)
- Jeep Wagoneer (Hurricane, max tow) '22-26: no pickup bed (cannot hitch a fifth wheel)
- Jeep Wrangler Unlimited 4-dr (tow pkg) '18-26: no pickup bed (cannot hitch a fifth wheel)
- Kia Telluride (tow pkg) '20-26: no pickup bed (cannot hitch a fifth wheel)
- Land Rover Defender '20-26: no pickup bed (cannot hitch a fifth wheel)
- Land Rover Discovery '17-26: no pickup bed (cannot hitch a fifth wheel)
- Lexus GX 550 (tow pkg) '24-26: no pickup bed (cannot hitch a fifth wheel)
- Lexus LX 600 '22-26: no pickup bed (cannot hitch a fifth wheel)
- Mazda CX-90 (3.3 turbo, tow pkg) '24-26: no pickup bed (cannot hitch a fifth wheel)
- Mercedes-Benz Sprinter '19-26: no pickup bed (cannot hitch a fifth wheel)
- Nissan Armada (3.5 twin-turbo, tow pkg) '25-26: no pickup bed (cannot hitch a fifth wheel)
- Nissan Armada (tow pkg) '17-24: no pickup bed (cannot hitch a fifth wheel)
- Nissan Frontier (3.8 V6, tow pkg) '22-26: over by ~10,457 lb loaded
- Nissan Pathfinder (tow pkg) '22-26: no pickup bed (cannot hitch a fifth wheel)
- Nissan Titan (5.6 V8, tow pkg) '17-24: over by ~8,107 lb loaded
- Nissan Titan XD (Cummins diesel) '16-19: over by ~5,452 lb loaded
- Ram 1500 (3.0 Hurricane, max tow) '25-26: over by ~6,442 lb loaded
- Ram 1500 (5.7 Hemi eTorque, max tow) '19-24: over by ~5,417 lb loaded
- Ram 1500 (5.7 Hemi, max tow) '11-18: over by ~7,332 lb loaded
- Ram 2500 (6.7 Cummins) '11-18: over by ~712 lb loaded
- Ram ProMaster '14-26: no pickup bed (cannot hitch a fifth wheel)
- Rivian R1S '22-26: no pickup bed (cannot hitch a fifth wheel)
- Rivian R1T '22-26: over by ~6,992 lb loaded
- Subaru Ascent '19-26: no pickup bed (cannot hitch a fifth wheel)
- Subaru Outback (XT / Wilderness) '20-26: no pickup bed (cannot hitch a fifth wheel)
- Tesla Cybertruck '24-26: over by ~6,992 lb loaded
- Tesla Model X (tow pkg) '16-26: no pickup bed (cannot hitch a fifth wheel)
- Tesla Model Y (tow pkg) '21-26: no pickup bed (cannot hitch a fifth wheel)
- Toyota 4Runner (4.0 V6) '11-24: no pickup bed (cannot hitch a fifth wheel)
- Toyota 4Runner (i-Force Max) '25-26: no pickup bed (cannot hitch a fifth wheel)
- Toyota Grand Highlander (i-Force Max) '24-26: no pickup bed (cannot hitch a fifth wheel)
- Toyota Highlander (tow pkg) '20-26: no pickup bed (cannot hitch a fifth wheel)
- Toyota Land Cruiser (i-Force Max) '24-26: no pickup bed (cannot hitch a fifth wheel)
- Toyota Sequoia (i-Force Max, tow pkg) '23-26: no pickup bed (cannot hitch a fifth wheel)
- Toyota Sienna '21-26: no pickup bed (cannot hitch a fifth wheel)
- Toyota Tacoma (i-Force Max, tow pkg) '24-26: over by ~11,042 lb loaded
- Toyota Tacoma (V6, tow pkg) '16-23: over by ~10,772 lb loaded
- Toyota Tundra (5.7 V8, tow pkg) '11-21: over by ~7,712 lb loaded
- Toyota Tundra (i-Force Max, tow pkg) '22-26: over by ~6,092 lb loaded
- Volkswagen Atlas (tow pkg) '18-26: no pickup bed (cannot hitch a fifth wheel)
These verdicts assume 2 people aboard with typical gear. See the margin for your truck and your crew →
THE SPECS
Length42.9 ft
Height (incl. A/C)13.4 ft
Width8.4 ft
GVWR19,000 lb
Dry weight15,400 lb
Dry tongue weight2,800 lb
Sleeps5
Slide-outs4
Axles2
Fresh water83 gal
Grey water106 gal
Black water53 gal
Air conditioning15,000 BTU
Solar (standard)330 W
A missing row means the maker never published that figure: unknown, not zero.
WHERE PEOPLE SLEEP
- 1× Front queen bed, king optional(Permanent)60×80
- 1× Mid-room bunk above the sofa(Permanent)30×72
- 1× 70 in. tri-fold sofa beneath the bunk(Convertible)—
- 1× Dinette converts to a bed(Convertible)—
HOW IT'S BUILT: 4/5
WallsLaminated fiberglass
FrameAluminum
RoofWalk-on
UnderbellyEnclosed
Grand Design (Better tier): Solitude is Grand Design's full-profile flagship: R-11 welded-aluminum laminated walls, 101" widebody chassis, MORryde independent suspension and 17.5" H-rated tires — genuine full-time-capable construction.
YEAR BY YEAR: WHAT CHANGED
- 2025Introduced, replacing the 378MBS
- 2027Moved to dealer-stock-only status
FINDING ONE
Patient search: weeks of watching, and probably some travel. Why: only 2 model years. Estimated from build volume and production span, not a count of live listings.
OUR TAKE
Mid-bunk Solitude; now dealer stock only. Lowest overall height in the line at 12 ft 9 in.
OTHER SOLITUDE FLOORPLANS
2930RL · 15,000 lb · sleeps 2305RE · 16,000 lb · sleeps 4310GK · 19,000 lb · sleeps 43330RE · 16,800 lb · sleeps 6344GK · 16,800 lb · sleeps 6345GK · 16,800 lb · sleeps 43460FL · 16,800 lb · sleeps 63540GK · 16,800 lb · sleeps 43550BH · 16,800 lb · sleeps 8366DEN · 16,000 lb · sleeps 5370DV · 19,000 lb · sleeps 4372WB · 16,800 lb · sleeps 4373FB · 16,800 lb · sleeps 43740BH · 16,800 lb · sleeps 8the whole line →
Find one for sale
Live listings for the 388MBS on the big marketplaces. Each search opens pre-filled with this exact floorplan:
Inventory varies by site and day. Slim pickings? search the whole Solitude line ↗
Is the 388MBS your #1, or just a spec sheet?
These are the facts. Whether it beats the other six thousand rigs for you depends on what you care about. Set your priorities as sliders, switch on your hard limits, and watch the whole market re-rank around them. Every exclusion explained, every margin shown.
See where it ranks for you →Data compiled from manufacturer spec sheets, retrieved 2026-07.