2026 Keystone Montana High Country377FL

The 377FL inverts the usual layout: the living area sits up front over the hitch as a raised front room, with the kitchen and the rest of the coach stepping down behind it. It is the entertainer of the profiled plans — a front great room on four slide-outs, sleeping ten, in a body just under 42 feet. The equipment is the standard High Country package: a GE 18-cubic-foot residential refrigerator with a 2,000-watt inverter, a three-burner range, a 5,000-BTU fireplace and a central vacuum, 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 13,513 pounds and the dry pin at 2,620, and adding the 3,107-pound cargo capacity gives a 16,620-pound GVWR. 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 75/78/39-gallon fresh/grey/black tanks are standard — note the smaller grey and black tanks that come with the front-living floor. At a starting MSRP around $108,600, with street pricing below placard, the 377FL is the High Country for buyers who want a front entertainment room and ten-berth capacity, and who tow with a properly rated three-quarter-ton or one-ton truck.

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 377FL 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 20% of the 3,107-pound cargo capacity, leaving the 377FL with a usable gear budget even when you tow full.

The published dry pin weight of 2,620 pounds is 19% of this floorplan’s 13,513-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 16,620-pound GVWR the 377FL is towing 3,107 pounds more than its 13,513-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 78 grey and 39 black, so waste capacity keeps pace with supply and the fresh tank is the constraint that ends a dry stay.

Ranked by GVWR, the 377FL sits 3 of 6 in the Montana High Country line: 16,620 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 381TB is 2 pounds lighter at 16,618 lb GVWR; and Montana High Country 351BH is 35 pounds heavier at 16,655 lb GVWR.

Against the 377FL: the Cedar Creek 361RL is 5 lb heavier and 2 ft shorter and sleeps 6 fewer; the Columbus 383RLH is 15 lb heavier; the Puma Mesa 383RLH is 15 lb heavier. 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.

Named sources publish 16 of the 18 specification fields this catalogue tracks for the 377FL (95% complete on the full field set).

Not published for this floorplan: exterior width, interior height. Those rows are left blank rather than copied from a sibling floorplan.

Sourcing rules: methodology.