2026 Keystone Montana High Country381TB

The 381TB is the High Country built for a big or multi-generational family. It carries two full baths and two bedrooms — a front king suite and a rear bedroom with its own private entry — with a queen loft above the rear bedroom for two more, all wrapped around a center living area opened up by large slide-outs. The kitchen runs a coffee hutch and an island with dual extendable countertops, and the bath adds a skylight shower. It sleeps ten on four slide-outs in a 42-foot-5-inch body, on 7,000-pound Dexter Gladiator axles, a MORryde CRE-3000 suspension, Ground Control six-point electric auto-leveling and a 12-inch I-beam.

Published figures put the dry weight at 14,364 pounds — the heaviest of the profiled plans — and the dry pin at 2,705, and adding the 2,254-pound cargo capacity gives a 16,618-pound GVWR. That cargo number is the tightest of the profiled range, so watch payload closely: a full family plus water and gear eats into 2,254 pounds quickly. A single 15,000-BTU Coleman Mach Quiet Series air conditioner with a heat pump, a 35,000-BTU furnace, an on-demand tankless water heater and generous 75/135/98-gallon fresh/grey/black tanks are standard. At a starting MSRP around $108,800, with street pricing below placard, the 381TB is the two-bath High Country for large families — firmly one-ton territory once loaded.

Montana High Country is Keystone's lighter luxury fifth wheel, below the full-size Montana and cross-shopped against Grand Design's Reflection and Solitude, Forest River's Cedar Creek and Sabre, Alliance's Avenue and Jayco's Pinnacle. The 2026 line runs to eleven floorplans; the six broadest-appeal layouts are profiled in full, and the 381TB on this page is highlighted. The full lineup, including the catalogued plans, is on the line hub.

This floorplan carries its water comfortably. A full 75-gallon fresh tank is roughly 28% of the 2,254-pound cargo capacity, leaving the 381TB with a usable gear budget even when you tow full.

The published dry pin weight of 2,705 pounds is 19% of this floorplan’s 14,364-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 16,618-pound GVWR the 381TB is towing 2,254 pounds more than its 14,364-pound dry figure, and that is the number your vehicle has to be rated for — not the brochure weight.

Tank balance is generous here: 75 gallons of fresh against 135 grey and 98 black, so waste capacity keeps pace with supply and the fresh tank is the constraint that ends a dry stay.

Ranked by GVWR, the 381TB sits 2 of 6 in the Montana High Country line: 16,618 pounds against a line that runs from 15,203 to 16,780 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 High Country 295RL is 1,415 pounds lighter at 15,203 lb GVWR; and Montana High Country 377FL is 2 pounds heavier at 16,620 lb GVWR.

Against the 381TB: the Cedar Creek 361RL is 7 lb heavier and 3 ft shorter and sleeps 6 fewer; the Columbus 383RLH is 17 lb heavier and 1 ft shorter; the Puma Mesa 383RLH is 17 lb heavier and 1 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 High Country floorplans profiled here run 11,595 to 14,364 pounds dry and 34 to 42 feet of exterior length across 6 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 High Country line hub.

This catalog tracks 18 specification fields per floorplan. Named sources publish 16 of them for the 381TB. 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: exterior width, interior height. 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 (95%) 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.