2026 Keystone Montana3623EB

The 3623EB is the gear-hauler of the rear-living Montanas. Behind the lounge it adds a rear bike garage — a pass-through storage bay for bicycles and outdoor equipment — set into a four-slide floorplan with a kitchen island, a private front bedroom with a king bed and a 32-inch TV, and a rear room running a hide-a-bed sofa and powered theater seating across a 50-inch Smart TV and a 5,000-BTU fireplace. An outside shower, central vacuum and washer/dryer prep round it out.

RVUSA lists a 2,735-pound dry pin and a 2,590-pound payload; the 14,135-pound dry weight derives a GVWR near 16,725 pounds. A single 15,000-BTU Coleman Mach heat-pump air conditioner is standard with a triple-15K CX3 package optional, alongside a 35,000-BTU furnace, a 16-gallon water heater and an 18-cubic-foot residential refrigerator on a 2,000-watt inverter. The Legacy Edition option loads it toward four-season, off-grid use with Dexter disc brakes, a Furrion observation system, an electric power-cord reel, a surge protector, electric dump valves and a roof-mounted Starlink kit.

At an MSRP of $129,878 it is priced with the larger plans but aimed at a specific buyer — the couple who wants the bikes and the kayak paddles inside the coach, not strapped to the 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 3623EB 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 23% of the 2,590-pound cargo capacity, leaving the 3623EB with a usable gear budget even when you tow full.

The published dry pin weight of 2,735 pounds is 19% of this floorplan’s 14,135-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 16,725-pound GVWR the 3623EB is towing 2,590 pounds more than its 14,135-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 3623EB sits 5 of 13 in the Montana line: 16,725 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 3231CK is 45 pounds lighter at 16,680 lb GVWR; and Montana 3100RL is 1,275 pounds heavier at 18,000 lb GVWR.

Against the 3623EB: the Wolf Pack 352PACK15 is 20 lb heavier and 5 ft longer; the Columbus 384RKH is 35 lb lighter and 3 ft longer; the Puma Mesa 384RKH is 35 lb lighter and 3 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 3623EB. 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 (96%) 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.