2026 Keystone Montana3532SP

The 3532SP is the line’s side-patio plan — the "SP" is a fold-down deck that swings out from the roadside wall to add an elevated private patio off the living area, a feature no other Montana luxury floorplan offers. Inside it is a king-bed couples’ layout with a pull-down storage pantry, an L-shaped hide-a-bed sofa and powered theater seating across a fireplace, and a private front bedroom.

It rides on the full Montana luxury build and ships with the triple-15,000-BTU CX3 air-conditioning package and a 20-cubic-foot 12-volt refrigerator among its highlighted features. The 14,405-pound dry weight and 2,730-pound dry pin place it mid-pack on weight; the GVWR and payload shown are flagged — the 2026 structured payload was not separately published, so the figures carry forward the plan’s 16,500-pound rating pending plan-specific confirmation.

At an MSRP near $125,878 it slots between the rear-living couples’ plans and the larger four-slide coaches. It is the Montana for a buyer who wants an outdoor living space built into the coach — a patio plan in a class that almost never offers one.

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 3532SP 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 28% of the 2,095-pound cargo capacity, leaving the 3532SP with a usable gear budget even when you tow full.

The published dry pin weight of 2,730 pounds is 19% of this floorplan’s 14,405-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 16,500-pound GVWR the 3532SP is towing 2,095 pounds more than its 14,405-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 3532SP sits 2 of 13 in the Montana line: 16,500 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 3531RE is 20 pounds lighter at 16,480 lb GVWR; and Montana 3123RL is 80 pounds heavier at 16,580 lb GVWR.

Against the 3532SP: the Columbus 377DS is 20 lb lighter and 3 ft longer; the Puma Mesa 377DS is 20 lb lighter and 3 ft longer; the Sandstorm 3300 is 55 lb heavier and 2 ft shorter. 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 3532SP. 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 (88%) 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.