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.

A full 75-gallon fresh tank is about 626 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 20% of the 377FL’s 3,107 lb cargo capacity, leaving 2,482 lb (248 lb per rated berth). Across 6 Montana High Country floorplans the water share runs 17% to 28%, and 2 give up more than this one. Nearest on that share: Montana High Country 351BH at 19% and Montana High Country 385BR at 22%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).

Closest sibling: the Montana High Country 385BR, nearest on the published figures. It differs on 7 of the 9 fields both publish (this plan first): length 41 ft 11 in vs 40 ft 9 in; dry weight 13,513 lb vs 13,794 lb; GVWR 16,620 lb vs 16,685 lb; cargo capacity 3,107 lb vs 2,891 lb; dry hitch weight 2,620 lb vs 2,685 lb; grey tank 78 gal vs 87 gal; black tank 39 gal vs 48 gal. They match on sleeps and fresh tank.

Either side of it by GVWR: Montana High Country 381TB is 2 lb lighter (16,618 lb GVWR); Montana High Country 351BH is 35 lb heavier (16,655 lb GVWR).

All 6 Montana High Country floorplans: Montana High Country line hub.

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.

16 of the 18 fields this catalogue tracks are published for the 377FL. Not published: exterior width, interior height.

Sourcing rules: methodology.