2026 Keystone Montana3123RL

The 3123RL is where the Montana luxury line starts. It is a triple-slide rear-living fifth wheel with a kitchen island and a private front bedroom — the classic couples’ layout — carrying the full Montana build (12-inch I-beam z-frame chassis, walkable Alpha TPO roof, the Four-Season Living package, hardwood cabinetry, solid-surface counters and the La-Z-Boy furniture package) at the most accessible point in the range.

Its numbers make it the easiest luxury Montana to tow. RVUSA lists a 2,580-pound dry pin — the lowest of the six profiled plans — against a 3,699-pound payload, and a dealer-listed 12,881-pound dry weight derives a GVWR near 16,580 pounds, lighter than the 18,000-pound rating that the larger plans carry. A single 15,000-BTU Coleman Mach heat-pump air conditioner is standard (a triple-15K package is optional), with a 35,000-BTU furnace, an 18-cubic-foot residential refrigerator on a 2,000-watt inverter and a king bed.

At an MSRP of $116,693 — the entry price of the line — it is the Montana for a buyer who wants the brand’s luxury build and rear-living layout without the length, weight or price of the full-timer plans. The optional Legacy Edition adds Dexter disc brakes, a power-cord reel, a surge protector and a roof-mounted Starlink kit for buyers who want to load it toward four-season, off-grid use.

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 3123RL 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 3,699-pound cargo capacity, leaving the 3123RL with a usable gear budget even when you tow full.

The published dry pin weight of 2,580 pounds is 20% of this floorplan’s 12,881-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 16,580-pound GVWR the 3123RL is towing 3,699 pounds more than its 12,881-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 3123RL sits 3 of 13 in the Montana line: 16,580 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 3532SP is 80 pounds lighter at 16,500 lb GVWR; and Montana 3231CK is 100 pounds heavier at 16,680 lb GVWR.

Against the 3123RL: the Pinnacle 32RLTS is 20 lb heavier and 1 ft longer; the Columbus 389FLH is 25 lb lighter and 8 ft longer; the Puma Mesa 389FLH is 25 lb lighter and 8 ft longer. 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 3123RL. 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 (97%) 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.