01 What makes it unique
The 310GK is where the Solitude line starts, and the plan that opens the brand’s extended-stay luxury to the broadest range of trucks. At about 12,100 pounds dry it is the lightest coach in the line, yet it still carries the full Solitude build: the drop-frame 101-inch widebody chassis, a MORryde pin box, 8,000-pound axles, a walk-on TPO roof and the fully enclosed, heated underbelly. The layout is rear-kitchen, with a tri-fold hide-a-bed sofa, theater seating, a kitchen island and an outside kitchen for the campsite.
Its numbers make it the easiest Solitude to tow. RVUSA lists a published 19,000-pound GVWR against the 12,100-pound dry weight, which leaves an unusually large 6,900-pound payload — the most of any plan in the line — and a 2,350-pound dry pin, the lowest of the profiled plans. A single 30,000-BTU air-conditioning system, a 35,000-BTU furnace, a 20-cubic-foot 12-volt residential refrigerator and the standard 330-watt roof solar package come standard, with three slide-outs and two awnings.
At an MSRP of $141,620 it is the most accessible Solitude, and dealers discount it heavily — street prices well under the placard are common. For a couple who wants Grand Design’s flagship build and a rear kitchen without the length, weight or pin of the big full-timer plans, the 310GK is the line’s natural entry.
02 Full specifications
Dimensions
- Exterior length
- 34' 4"
- Exterior width
- 8' 5"
- Exterior height
- 13' 5"
- Interior height
- 8' 1"
Weights
- Dry / unit base weight
- 12,100 lbs
- GVWR (max loaded)
- 19,000 lbs
- Net cargo / payload
- 6,900 lbs
- Dry pin weight
- 2,350 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
- 4
- Slides
- 3
- Awnings
- 2
- Primary bed
- King
Drawn to scale
Weight budget
Size, with end view
Holding tanks
Axles, wheels and nose shape are schematic; not a floorplan. Data: dataset.
Towing it
Loaded range: 15–25% of GVWR on the pin, a rule of thumb, not a measurement of this unit. No truck ratings or hitch classes (why; NHTSA, DOT HS 809 433).
03 The Solitude floorplan family
Solitude is Grand Design's flagship fifth wheel. 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 310GK 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. 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 matched to its RVUSA floorplan record by code and title; 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 Notes on this floorplan
Lightest in the line
At about 12,100 lb dry it is the most tow-friendly Solitude — the widest truck compatibility in the luxury line.
Huge payload
A published 6,900-lb payload — by far the most of any profiled plan — leaves enormous margin for gear, water and full-timer supplies.
Full Solitude build at entry price
The same 101" widebody drop-frame chassis, MORryde pin box and heated underbelly as the big plans, at the line’s lowest MSRP.
Rear kitchen + outside kitchen
A rear-galley layout with a kitchen island, tri-fold sofa and an exterior cooking station — a campsite-friendly couples’ plan.
05 How it compares
The next size up — a rear-living plan with a central island and prep bar, a touch more length and weight.
Keystone’s rear-living luxury entry — the direct big-luxury-FW cross-shop against the Solitude line.
Grand Design’s own mid fifth wheel — lighter and cheaper, a half-ton-friendlier step below Solitude.
06 Loading it for a trip
A full 81-gallon fresh tank is about 676 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 10% of the 310GK’s 6,900 lb cargo capacity, leaving 6,224 lb (1,556 lb per rated berth). Across 10 Solitude floorplans the water share runs 10% to 22%, and this plan’s is the lowest. Nearest on that share: Solitude 370DV at 13%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).
07 Where this floorplan sits
Closest sibling: the Solitude 370DV, nearest on the published figures. It differs on 4 of the 9 fields both publish (this plan first): length 34 ft 4 in vs 37 ft 10 in; dry weight 12,100 lb vs 13,600 lb; cargo capacity 6,900 lb vs 5,400 lb; dry hitch weight 2,350 lb vs 2,484 lb. They match on sleeps, GVWR, fresh tank, grey tank and black tank.
| Solitude plans | This plan | Position, low to high | Range |
|---|---|---|---|
| GVWR (lb) | 19,000 | 1–9 of 10 | 19,000–23,500 |
| Dry weight (lb) | 12,100 | 1 of 10 | 12,100–19,000 |
| Cargo capacity (lb) | 6,900 | 10 of 10 | 3,015–6,900 |
| Dry hitch weight (lb) | 2,350 | 1 of 10 | 2,350–3,290 |
| Length | 34 ft 4 in | 1 of 10 | 34 ft 4 in–42 ft 11 in |
| Fresh tank (gal) | 81 | 1–9 of 10 | 81–83 |
| Grey tank (gal) | 106 | 1–9 of 10 | 106–159 |
| Black tank (gal) | 53 | 1–6 of 10 | 53–106 |
| Sleeps | 4 | 1–3 of 10 | 4–8 |
Either side of it by GVWR: Solitude 370DV matches it at 19,000 lb GVWR.
| Nearest Solitude siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Solitude 310GK | 34 ft 4 in | 4 | 12,100 | 19,000 | 6,900 | 2,350 | 81 |
| Solitude 370DV | 37 ft 10 in | 4 | 13,600 | 19,000 | 5,400 | 2,484 | 81 |
| Solitude 390RK | 42 ft 5 in | 6 | 14,562 | 19,000 | 4,438 | 2,794 | 81 |
| Solitude 382WB | 41 ft 4 in | 6 | 14,866 | 19,000 | 4,134 | 3,052 | 81 |
| Solitude 376RD | 42 ft 5 in | 6 | 15,180 | 19,000 | 3,820 | 3,050 | 81 |
| Solitude 388MBS | 42 ft 11 in | 5 | 15,985 | 19,000 | 3,015 | 2,930 | 81 |
All 10 Solitude floorplans: Solitude line hub.
| Other lines, nearest by GVWR | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| 310GK | 19,000 | 12,100 | 4 | 34 ft 4 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 310GK: the Influence 3804DS is 8 ft longer and sleeps 2 more; the Momentum 344M is 6 ft longer and sleeps 2 more; the Paradigm 385FL is 7 ft longer and sleeps 2 more.
08 Common questions about the 310GK
How much does the 310GK weigh?
12,100 lb dry; 19,000 lb GVWR, the most it may weigh loaded.
How much can the 310GK carry?
6,900 lb, 36% of its GVWR (median across 307 fifth wheels here: 19%). A full fresh tank uses 676 lb of it.
What is the pin weight of the 310GK?
2,350 lb dry, 19% of the dry weight (median across 386 fifth wheels here: 19%).
What size tow vehicle does the 310GK need?
A tow rating of at least 19,000 lb, plus payload for the loaded pin weight, passengers and cargo.
How many people does the 310GK sleep?
It is rated to sleep 4. 7 of the 10 Solitude floorplans that publish a count sleep more.
What are the tank capacities on the 310GK?
Fresh 81, grey 106, black 53 gallons. Off hookups, fresh water runs out first.
How long is the 310GK?
34' 4" overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
18 of the 18 fields this catalogue tracks are published for the 310GK. Not published: tire size (a description is published, a size is not).
Sourcing rules: methodology.
10 Manuals & documents
Sources: granddesignrv.com (linked below); the full source note is at the foot of the page.
11 NHTSA safety record
NHTSA holds 15 recall campaigns and 135 owner complaints against the Solitude line. They are counted separately: a recall is a confirmed defect with a remedy, a complaint one owner’s unverified account.
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%).
Reports that name the 310GK
4 of those records name this floorplan specifically rather than the line as a whole.
| Type | Date | Reference | What it says |
|---|---|---|---|
| Complaint | 5 Feb 2026 | ODI 11716054 | I was informed to reference this code PE24029. 2021 5th Wheel - Grand Design Solitude 310GK. Frame cracks and separation. June 2025, contact made with Grand Design and they approved for us… |
| Complaint | 27 Jun 2017 | ODI 11001834 | Just picked up A brand new 2018 grand design solitude 310GK 5TH wheel trailer and noticed that the brakes don't work very well. Towed the unit home 400 miles and decided to contact lippert… |
| Complaint | 27 May 2017 | ODI 10991920 | We purchased A brand new 2017 grand design solitude 310GK. Upon reviewing the grand design owner's forum, numerous people reported their brakes being covered in grease from the leaking… |
| Complaint | 20 May 2017 | ODI 10990759 | Our grand design solitude 310GK was manufactured in sep 2016. The lci/lippert axles leaked grease out the backside past the lip seal and got all over the brakes and magnet. Nothing wrong… |
Recall coverage here is not complete, and complaints are owners’ unverified reports (how this record is built). Check a specific VIN at NHTSA before you buy. Full tables are on the Solitude line page.