2026 Grand Design Solitude414LJMJ

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.

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.

This floorplan carries its water comfortably. A full 83-gallon fresh tank is roughly 15% of the 4,500-pound cargo capacity, leaving the 414LJMJ with a usable gear budget even when you tow full.

The published dry pin weight of 3,200 pounds is 17% of this floorplan’s 19,000-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 23,500-pound GVWR the 414LJMJ is towing 4,500 pounds more than its 19,000-pound dry figure, and that is the number your vehicle has to be rated for — not the brochure weight.

Tank balance is generous here: 83 gallons of fresh against 159 grey and 106 black, so waste capacity keeps pace with supply and the fresh tank is the constraint that ends a dry stay.

Of the 10 Solitude floorplans profiled here, the 414LJMJ carries the highest GVWR at 23,500 pounds. It is the top of the line by weight, which makes tow-vehicle capability the first thing to settle rather than the last.

Either side of it in the same line: Solitude 417KB is 4,500 pounds lighter at 19,000 lb GVWR.

Against the 414LJMJ: the Momentum 392M is 3 ft longer and sleeps 3 more; the Riverstone 442MC is 345 lb heavier; the Model G 3950 is 500 lb lighter and 3 ft longer and sleeps 2 more. 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.

This catalog tracks 18 specification fields per floorplan. Named sources publish 18 of them for the 414LJMJ. 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 (94%) 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.