01 What makes it unique
The 414LJMJ is a step above the rest of the Solitude line, on a heavier chassis. Where every other plan rides on two 8,000-pound axles with a 19,000-pound GVWR, the 414LJMJ runs three axles and a 23,500-pound GVWR — a full-time-residence coach with a mid living room, a bunk-and-loft sleeping zone and a layout built for living aboard year-round. Three awnings and a lower 12-foot-9 profile distinguish it from the rest of the line on the outside.
Its capacities are the largest in the lineup. A 159-gallon grey tank and a 106-gallon black tank — by far the biggest holding tanks of any Solitude — are sized for extended off-grid and full-time stays, on a 19,000-pound dry weight with a published 23,500-pound GVWR that leaves a 4,500-pound payload and a 3,200-pound dry pin. The standard Solitude build carries through — the 101-inch widebody drop-frame chassis, MORryde pin box, heated underbelly, 330-watt roof solar and a 20-cubic-foot 12-volt refrigerator — scaled up onto the triple-axle frame.
It is the most expensive and most capable Solitude, with a dealer-listed MSRP near $196,800. At 19,000 pounds dry on three axles, it needs a properly rated one-ton dually to tow safely loaded — this is heavy-duty fifth-wheel territory. For a couple or family genuinely living aboard full-time who want the largest tanks and the heaviest-duty Solitude chassis, the triple-axle 414LJMJ is the flagship of the line.
02 Full specifications
Dimensions
- Exterior length
- 42' 10"
- Exterior width
- 8' 5"
- Exterior height
- 12' 9"
- Interior height
- 8' 1"
Weights
- Dry / unit base weight
- 19,000 lbs
- GVWR (max loaded)
- 23,500 lbs
- Net cargo / payload
- 4,500 lbs
- Dry pin weight
- 3,200 lbs
Capacities
- Fresh water
- 83 gal
- Grey water
- 159 gal
- Black water
- 106 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
- 3 (triple)
- 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
- 4
- Awnings
- 3
- 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 414LJMJ 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
Triple-axle heavyweight
Three axles and a 23,500-lb GVWR — a heavier chassis class than every other Solitude, built for full-time living.
Largest tanks in the line
A 159-gallon grey and 106-gallon black tank — by far the biggest holding capacity of any Solitude, sized for long off-grid stays.
Mid living + bunk and loft
A mid living room with a bunk-and-loft sleeping zone — a true full-timer family layout under a lower 12-foot-9 roof.
Needs a one-ton dually
At 19,000 lb dry on three axles, this is heavy-duty-truck territory — a properly rated one-ton dually is required; weigh the loaded coach.
MSRP dealer-sourced
The starting price shown is from a dealer listing rather than an RVUSA structured record; confirm current pricing with a dealer.
05 How it compares
The two-full-bath plan on the standard 19,000-lb chassis — lighter and far easier to tow if the triple-axle capacity isn’t needed.
The bunkroom family plan on the standard chassis — a lighter family layout catalogued on the hub.
Keystone’s full-timer flagship — the natural big-luxury-FW cross-shop for living aboard.