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
Verified specs, drawn to scale
Original graphics built from this floorplan’s own verified figures.
Loaded weight budget
Size, drawn to scale
Holding tanks
These graphics are generated from the same verified record that builds the table above, and are published under this site’s own licence — nothing here is traced from, or derived from, a manufacturer drawing or photo. Where a figure is not published for this plan, the graphic that would need it is omitted rather than estimated. The full record is in the published dataset.
What it takes to tow this
Built from this floorplan’s verified weights. We publish the trailer side only.
We do not publish tow ratings for specific trucks. A single model can vary by thousands of pounds depending on engine, axle ratio, cab, drivetrain and package — the only authoritative figure is the one on your own door jamb. Loaded pin percentages are industry convention for fifth wheels (15–25% of loaded weight), not a measurement of this unit. Hitch classes are not used here as a rating: SAE J684 covers trailers to 10,000 lb GVWR and does not define Class V, and capacity boundaries differ between manufacturers — read the rating stamped on your hitch.
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.
06 Loading it for a trip
This floorplan carries its water comfortably. A full 81-gallon fresh tank is roughly 15% of the 4,438-pound cargo capacity, leaving the 390RK with a usable gear budget even when you tow full.
| Weight budget | Figure | What it means |
|---|---|---|
| Cargo capacity as published (CCC) | 4,438 lb | Everything you add: gear, water, propane, batteries, food, people’s belongings. |
| Fresh tank filled (81 gal × 8.34 lb) | −676 lb | Water is the heaviest thing most owners add, and it is added first. |
| Cargo budget left with a full fresh tank | 3,762 lb | 15% of this plan’s capacity is spent before a single bag is loaded. |
| Per sleeping position, water aboard | 627 lb | A rough share of what is left across the 6 berths this plan sleeps. |
The published dry pin weight of 2,794 pounds is 19% of this floorplan’s 14,562-pound dry weight. Fifth-wheel pin weight rides in the bed of the truck, so it comes off payload rather than off tow rating — and it rises with the trailer as you load it, not in proportion to what you put over the axles.
Nothing above changes the ceiling. Loaded to its 19,000-pound GVWR the 390RK is towing 4,438 pounds more than its 14,562-pound dry figure, and that is the number your vehicle has to be rated for — not the brochure weight.
Tank balance is generous here: 81 gallons of fresh against 106 grey and 53 black, so waste capacity keeps pace with supply and the fresh tank is the constraint that ends a dry stay.
07 Where this floorplan sits
Ranked by GVWR, the 390RK sits 7 of 10 in the Solitude line: 19,000 pounds against a line that runs from 19,000 to 23,500 pounds. That position is the useful thing to know, because the plans immediately either side of it are the real alternatives.
Either side of it in the same line: Solitude 388MBS matches it exactly at 19,000 lb GVWR; and Solitude 391DL matches it exactly at 19,000 lb GVWR.
8 other Solitude plans share this floorplan’s 19,000 lb GVWR, so the ranking above separates plans that tow to the same ceiling. On a shared chassis the figure that actually differs between them is cargo capacity and where the weight sits, not the rating.
| Comparable fifth wheels | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| 390RK | 19,000 | 14,562 | 6 | 42 ft 5 in |
| Influence 3804DS | 19,000 | 14,603 | 6 | 42 ft 6 in |
| Momentum 344M | 19,000 | 15,910 | 6 | 39 ft 11 in |
| Paradigm 385FL | 19,000 | 15,487 | 6 | 41 ft 4 in |
| Seismic 3512 | 18,995 | 14,285 | 7 | 41 ft 7 in |
| Riverstone 39RKFB | 18,975 | 16,511 | 4 | 42 ft 1 in |
| Bighorn 40DB | 18,850 | 16,110 | 8 | 43 ft 10 in |
Against the 390RK: the Momentum 344M is 2 ft shorter; the Paradigm 385FL is 1 ft shorter. Those are differences in the published numbers only — what they cost, how they are built and how they live are separate questions each of those pages answers on its own terms.
Those are the nearest fifth wheels from other lines by weight — one per line, picked by proximity on that figure and nothing else. They are listed so the same tow vehicle can be checked against real alternatives, not because they are equivalent inside; layout, build and price diverge sharply across that group.
For scale, the Solitude floorplans profiled here run 12,100 to 19,000 pounds dry and 34 to 43 feet of exterior length across 10 plans. Where a floorplan falls in that spread usually says more about which vehicle can tow it, and which site it fits, than the layout name does.
Every profiled floorplan in this line, with the full weight table, is on the Solitude line hub.
08 Common questions about the 390RK
How much does the 390RK weigh?
It leaves the factory at 14,562 pounds dry, and its manufacturer-set loaded ceiling (GVWR) is 19,000 pounds. Real towing weight lands between the two and depends entirely on what you load. Use the GVWR when matching a tow vehicle; the dry figure is only useful for comparing floorplans against each other.
How much can the 390RK carry?
Cargo carrying capacity is 4,438 pounds. That is the whole budget: water, propane, batteries, gear and everything you bring. Filling the 81-gallon fresh tank uses about 676 pounds of that.
What is the pin weight of the 390RK?
The published dry pin weight is 2,794 pounds. It is measured empty; loaded, it runs higher, and it comes out of your tow vehicle’s payload rather than its tow rating.
What size tow vehicle does the 390RK need?
Your vehicle needs a tow rating of at least 19,000 pounds — this floorplan’s GVWR — and enough payload left over for the hitch load, passengers and anything in the bed. This site does not publish tow ratings for specific vehicles, because one truck model varies by thousands of pounds across engine, axle ratio, cab and package. The figure that governs is the payload sticker on your own door jamb.
How many people does the 390RK sleep?
It is rated to sleep 6. Rated sleeping positions include convertible furniture, so count the beds against how you actually travel rather than against the number.
What are the tank capacities on the 390RK?
Fresh 81 gallons, grey 106 gallons, black 53 gallons. Tank sizes set how long the floorplan can sit away from hookups, and the smallest of the three is what ends the stay.
How long is the 390RK?
Exterior length is 42' 5". Measure against your site length and your storage before committing — the exterior figure is the one that has to fit, and it includes the tongue or pin box.
Every figure in these answers is read from this page’s verified specification table. Where the manufacturer publishes nothing, the question is not answered rather than estimated.
09 What this page publishes, and what it does not
This catalog tracks 18 specification fields per floorplan. Named sources publish 18 of them for the 390RK. The rest are not shown, because the alternative is reading a figure across from a sibling floorplan or from what the segment usually does — and a number nobody published is worth less than an admitted gap.
Not published for this floorplan: tire size (a tire description is published, a size is not). If you find one of these in a manufacturer document for this plan, it belongs on this page.
The completeness figure at the foot of this page (98%) measures the same thing on the full field set: it is a measurement of how much this floorplan’s manufacturer publishes, not of how much research went into the page.
How every figure here was sourced and checked is set out on the methodology page.
11 NHTSA safety record
This floorplan belongs to the Solitude line, and NHTSA holds 15 recall campaigns and 135 owner complaints against that line. They are separate records and are not added together — a recall is a manufacturer-confirmed defect with a remedy; a complaint is one owner’s account, which NHTSA does not verify.
What to look at on a used one. Across the 135 complaints filed on this line the most-reported components are structure (30%), unknown or other (19%) and service brakes (14%). That is where owners of this family have had trouble, so it is where an inspection is worth the time.
Reports that name the 390RK
3 of those records name this floorplan specifically rather than the line as a whole.
| Type | Date | Reference | What it says |
|---|---|---|---|
| Complaint | 23 May 2024 | ODI 11590456 | 2020 Grand Design 390 RK Noticed trim molding under bedroom area of 5th wheel rv had dropped from original position, on both sides of the trailer, in approximately same location. Took to a… |
| Complaint | 10 May 2024 | ODI 11588197 | I have been experiencing floor squeaking for more than a year now. It's in the front of the fifth wheel in what is the bedroom. Extending into the hallway, and bathroom. I tried to contact… |
| Complaint | 30 Nov 2023 | ODI 11557602 | While towing on I-75 at 65 MPH, the driver's side front storage doors came open. These doors had been shut, locked, and checked before departing. They were secured again and remained closed… |
Recall coverage is not complete — our harvest of NHTSA’s recall API ran 1,556 queries, of which 0 failed and 242 returned an explicit zero. A line can still be under-reported where NHTSA files a roster under a parent name, or where a match rests on the wording of the recall rather than its model field. Complaints come from the complete bulk file but are unverified and self-selected: a high count tracks how many units a line sold at least as much as how well it was built. Check a specific VIN at NHTSA before you buy. Full tables are on the Solitude line page.