2026 Keystone Montana3100RL

The 3100RL is the floorplan Keystone built the redesigned 2026 Montana around. It is a widebody — five inches wider inside than a standard fifth wheel — and a rear-living layout aimed squarely at couples who live in the main room rather than the bedroom. A wall of windows wraps the rear lounge around a 55-inch 4K TV with a JBL 2.1 soundbar and subwoofer and a fireplace, a solid-surface waterfall island anchors the galley, and a hidden swing-out pantry and a slide-out "Deskette" desk-and-chairs add residential function.

It is also the most heavily equipped Montana on cooling and chassis. Where the rest of the luxury line ships with a single 15,000-BTU air conditioner, the 3100RL carries three — an 18,000-BTU Furrion Chill Cube heat-pump main plus two 13,500-BTU units — and rides on Curt TCS 8,000-pound axles with Curt anti-lock brakes and a Helux pin box rather than the Dexter/MORryde running gear of the other plans. A 50-amp power-cord reel and electric dump valves are standard, and the structural warranty steps up to five years on the new build.

RVUSA lists a 3,970-pound payload and a 3,000-pound dry pin; at a dealer-typical street price well below the placard, it sits at the accessible end of the luxury line on price while leading it on width and equipment. Because the 3100RL is a brand-new widebody on its own chassis, the dry weight and GVWR shown here are derived and flagged — weigh the loaded coach and confirm the build sticker before matching it to a truck.

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 3100RL on this page is highlighted; each other profiled plan links to its own page.

This floorplan carries its water comfortably. A full 77-gallon fresh tank is roughly 16% of the 3,970-pound cargo capacity, leaving the 3100RL with a usable gear budget even when you tow full.

The published dry pin weight of 3,000 pounds is 21% of this floorplan’s 14,030-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 18,000-pound GVWR the 3100RL is towing 3,970 pounds more than its 14,030-pound dry figure, and that is the number your vehicle has to be rated for — not the brochure weight.

Tank balance is generous here: 77 gallons of fresh against 100 grey and 50 black, so waste capacity keeps pace with supply and the fresh tank is the constraint that ends a dry stay.

Ranked by GVWR, the 3100RL sits 6 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 3623EB is 1,275 pounds lighter at 16,725 lb GVWR; and Montana 3761FL 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 3100RL: the Cedar Creek 381MUD is 8 ft longer and sleeps 4 more; the Influence 3003RL is 1 ft shorter; the Paradigm 375RD is 6 ft longer and 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 16 of them for the 3100RL. 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 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 (93%) 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.