2026 Keystone Montana3781RL

The 3781RL is the plan dealers move most. It is a four-slide rear-living Montana with a kitchen island, a floor-to-ceiling pantry, a private front bedroom with a king bed and a conventional rear lounge — the configuration the largest share of Montana buyers choose, which is why dealers stock it deepest and discount it hardest. An outside shower and dual power awnings round out the exterior.

It rides on the full Montana luxury build — the 12-inch I-beam z-frame chassis, the walkable Alpha TPO roof, the Four-Season Living package, hardwood cabinetry, solid-surface counters and the La-Z-Boy furniture package. The 14,290-pound dry weight places it just above the mid plans; the GVWR and payload shown are flagged because the 2026 structured payload was not separately published, so the figures carry the line’s 18,000-pound rating pending plan-specific confirmation. A single 15,000-BTU Coleman Mach heat-pump air conditioner is standard with a triple-15K package optional.

At an MSRP near $139,999 the placard runs high, but as the volume plan it is also the most discounted — street prices near $105,000 are common. It is the Montana for a buyer who wants the most-shopped, easiest-to-resell rear-living layout in the line.

Montana is Keystone's flagship luxury fifth wheel and the best-selling luxury fifth wheel in North America. The line runs to fifteen floorplans for 2026; the six highest-demand layouts are profiled here in full, and the rest — along with the lighter, lower-profile Montana High Country sub-line — are catalogued on the line hub. The 3781RL on this page is highlighted; each other profiled plan links to its own page.

This floorplan carries its water comfortably. A full 70-gallon fresh tank is roughly 16% of the 3,710-pound cargo capacity, leaving the 3781RL with a usable gear budget even when you tow full.

No dry pin weight is published for this floorplan by any source this catalog accepts, so the hitch-share arithmetic is not shown here and the tow block on this page omits it. The figure exists on the trailer’s own weight sticker; a scale ticket taken with the trailer hitched is the reliable way to get it, and it is worth having before you buy rather than after.

Nothing above changes the ceiling. Loaded to its 18,000-pound GVWR the 3781RL is towing 3,710 pounds more than its 14,290-pound dry figure, and that is the number your vehicle has to be rated for — not the brochure weight.

Tank balance is generous here: 70 gallons of fresh against 88 grey and 49 black, so waste capacity keeps pace with supply and the fresh tank is the constraint that ends a dry stay.

Ranked by GVWR, the 3781RL sits 8 of 13 in the Montana line: 18,000 pounds against a line that runs from 16,480 to 18,000 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: Montana 3761FL matches it exactly at 18,000 lb GVWR; and Montana 3795FK matches it exactly at 18,000 lb GVWR.

7 other Montana plans share this floorplan’s 18,000 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.

Against the 3781RL: the Cedar Creek 381MUD is 2 ft longer and sleeps 4 more; the Influence 3003RL is 6 ft shorter; the Paradigm 375RD sleeps 1 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 Montana floorplans profiled here run 12,881 to 15,644 pounds dry and 35 to 43 feet of exterior length across 13 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 Montana line hub.

This catalog tracks 18 specification fields per floorplan. Named sources publish 15 of them for the 3781RL. 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: dry hitch weight, tire specification, awning. 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 (90%) 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.

Values on this page carrying an asterisk were derived by arithmetic from published figures, or come from a single source, rather than being printed directly by the manufacturer. The flag travels with the number into the downloadable spec sheet.

How every figure here was sourced and checked is set out on the methodology page.