01 What makes it unique
The 390RK is the rear-kitchen plan that defines the Solitude line for many buyers. A raised rear galley with a kitchen island and abundant counter and cabinet space looks out over the back of the coach, with double tri-fold hide-a-bed sofas and theater seating in the main room and an outside kitchen for cooking at the campsite. A private front bedroom with a king bed and a full bath complete a layout built for couples who entertain.
Five slide-outs open it up without pushing it to the heavy end. RVUSA lists a published 19,000-pound GVWR against a 14,562-pound dry weight, leaving a 4,438-pound payload and a 2,794-pound dry pin. The standard Solitude build carries through — 101-inch widebody drop-frame chassis, MORryde pin box, heated underbelly, 330-watt roof solar and a 20-cubic-foot 12-volt refrigerator — with a single 30,000-BTU air conditioner standard.
At an MSRP of $161,643 it sits in the heart of the line, and it is one of the most cross-shopped Solitude floorplans. For a couple who wants the signature rear-kitchen layout, five slides of living space and an outside kitchen, the 390RK is the archetypal Solitude.
02 Full specifications
Dimensions
- Exterior length
- 42' 5"
- Exterior width
- 8' 5"
- Exterior height
- 13' 5"
- Interior height
- 8' 1"
Weights
- Dry / unit base weight
- 14,562 lbs
- GVWR (max loaded)
- 19,000 lbs
- Net cargo / payload
- 4,438 lbs
- Dry pin weight
- 2,794 lbs
Capacities
- Fresh water
- 81 gal
- Grey water
- 106 gal
- Black water
- 53 gal
- Refrigerator
- 20 cu ft
Construction
- Frame
- Drop-frame · 101" widebody
- Walls
- 5-side aluminum cage · laminated
- Roof
- Walk-on TPO · limited-lifetime warranty
- Underbelly
- Fully enclosed · heated tanks & storage
Running gear
- Axles
- 2 (8,000 lb tandem)
- Hitch
- Fifth-wheel (in-bed) · MORryde® pin box
- Suspension
- MORryde® CRE3000 · Tow Assist ABS
- Tires
- 17.5" H-rated Cooper
Galley & bath
- Cooktop
- Professional-grade SS · built-in oven
- Refrigerator
- 20 cu ft
- A/C
- 30,000 BTU (single high-capacity)
- Water heater
- On-demand · whole-house filtration
Sleeping & layout
- Sleeps
- 6
- Slides
- 5
- Awnings
- 1
- Primary bed
- King
03 The Solitude floorplan family
Solitude is Grand Design's flagship fifth wheel and one of the best-selling luxury extended-stay fifth wheels in North America. The line runs to ten floorplans for 2026; the eight highest-demand layouts are profiled here in full, and the remaining two are catalogued on the line hub. The 390RK on this page is highlighted; each other profiled plan links to its own page.
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| 310GK | 34 ft | 4 | Light rear-kitchen entry, sub-13k dry |
| 370DV | 38 ft | 4 | Rear living, central island + prep bar |
| 380FL | 41 ft | 6 | Front living, bath-and-a-half, 5 slides |
| 382WB | 41 ft | 6 | Separate front living room, 5 slides |
| 376RD | 42 ft | 6 | Raised rear den, three sofas |
| 390RK | 42 ft | 6 | Rear kitchen, outdoor kitchen, 5 slides |
| 391DL | 42 ft | 8 | Two full baths, dual entry, sleeps 8 |
| 388MBS | 43 ft | 5 | Middle bunkroom, family, lower profile |
| 417KB | 42 ft | 4 | Rear kitchen, bath-and-a-half, master |
| 414LJMJ | 43 ft | 6 | Triple-axle flagship, mid bunk + loft |
Solitude is Grand Design's flagship extended-stay fifth wheel and one of the best-selling luxury fifth wheels in North America. The full line runs to ten floorplans for 2026; eight are profiled here and two more are catalogued above. Every plan rides on the same drop-frame 101-inch widebody chassis with a MORryde pin box, 8,000-pound axles and a fully enclosed heated underbelly, and ships with a 330-watt roof solar package, a 20-cubic-foot 12-volt refrigerator and an on-demand water heater with whole-house filtration as standard. Body specifications (lengths, heights, payload, tanks, sleeping, slides and awnings) are RVUSA-verified against the 2026 structured spec records, each page fp-slug and title checked; dry weight, GVWR, payload and pin weight are published per plan, and each plan's dry weight plus payload equals its GVWR exactly. Real loaded pin weights run higher — always weigh the loaded coach and confirm against your truck's payload and rear-axle ratings.
04 What owners & reviewers report
Signature rear kitchen
A raised rear galley with a kitchen island and a window wall — the layout most associated with the Solitude line.
Outside kitchen
An exterior cooking station with prep space and storage — a campsite feature for long stays.
Five slides, king bed
Double tri-fold sofas and theater seating across five slide-outs, with a private front bedroom and a king bed.
Heart-of-line plan
One of the most cross-shopped Solitude floorplans — the rear-kitchen plan many buyers start with.
05 How it compares
The shorter rear-living plan — lighter, three slides and a lower pin if the rear kitchen isn’t needed.
The other rear-kitchen plan — adds a bath-and-a-half and a master suite at a similar size.
Keystone’s best-selling rear-living plan — the direct big-luxury-FW cross-shop.