2027 Keystone Montana High Country391TB

Keystone publishes three weights for the Montana High Country 391TB: a shipping weight of 15,865 lb, a carrying capacity of 2,920 lb and a hitch weight of 2,785 lb. Those are Keystone’s own terms, and this page keeps them. Keystone does not call the first figure dry or unloaded weight, does not say the hitch figure is measured dry, and publishes no GVWR for any Montana High Country floorplan, so none of the three is renamed here and no loaded rating is worked out from them. The trailer’s own federal weight label, inside the door, is the document that carries its UVW, cargo capacity and GVWR.

Tank capacities are 77 gal fresh, 150 gal gray and 100 gal waste, as Keystone lists them. Fresh water weighs about 8.3 lb per US gallon, so a full fresh tank is roughly 639 lb on the road before anything else is loaded. The tire size Keystone lists is 215/75R17.5J; a fifth wheel puts its pin load into the truck bed, so it counts against the truck’s payload rather than its tow rating.

Against the 3 Montana High Country floorplans profiled here, this one is the 3rd by Keystone’s shipping weight, in a range from 12,275 lb (290RL) to 15,865 lb (391TB). Every figure in that comparison comes from the same Keystone page type for the same model year, so the comparison inside the series is like for like.

Every number on this page was read on 23 Oct 2026 from Keystone’s own floorplan page for the Montana High Country 391TB. That page carries no model year, so the year comes from the roster page that links it, which lists the Montana High Country floorplans under the heading “2027 Floorplans”. Keystone notes that its website reflects the most recent production run and that features and specifications change during the year.

How the 391TB differs from the other eight Montana High Country floorplans. Most distinctive first. Each rank counts only the siblings that publish that field, and a figure most of them share is left out. Not every one of these pages covers the same model years as this one (2027); each figure is the one its own page prints, so a rank compares pages, not one model year.

• Shipping weight (Keystone’s term), 15,865 lb: heaviest of three; next is the 300RK (12,540 lb).
• Carrying capacity (Keystone’s term), 2,920 lb: smallest of three; next is the 300RK (3,160 lb).
• Hitch weight as Keystone lists it, 2,785 lb: heaviest of three; next is the 290RL (2,255 lb).
• Length, 43 ft 11 in: longest of nine; next is the 381TB (42 ft 5 in).
• Grey tank, 150 gal: largest of nine; next is the 381TB (135 gal).
• Hitch weight as a share of shipping weight, 17.6%: second-smallest of three, between the 300RK (16.4%) and the 290RL (18.4%).
• Sleeping capacity, 9: fourth-largest of nine, between the 351BH and 373RD (8) and the 377FL, 381TB and 385BR (10).
• Fresh tank, 77 gal: largest of nine, level with the 290RL and 300RK; next are the 295RL, 351BH and four others (75 gal).

Next to the 300RK, the nearest lighter floorplan by shipping weight, the 391TB is 3,325 lb heavier by shipping weight, has 240 lb less carrying capacity, has a hitch weight 730 lb heavier, is 9 ft longer, has a grey tank 50 gal larger and sleeps five more; the two publish the same exterior height and fresh tank.

Keystone lists 5 Montana High Country floorplans for 2027. 3 have a complete Keystone figure set and no existing page here, and are profiled, from 12,275 lb to 15,865 lb shipping weight; the others are catalogued on this page with the reason against each. Keystone publishes shipping weight, carrying capacity and hitch weight for these trailers, and no GVWR.

Closest sibling: the Montana High Country 381TB, nearest on the published figures. It differs on 5 of the 5 fields both publish (this plan first): length 43 ft 11 in vs 42 ft 5 in; sleeps 9 vs 10; hitch weight 2,785 lb vs 2,705 lb; fresh tank 77 gal vs 75 gal; grey tank 150 gal vs 135 gal.

All 9 Montana High Country floorplans: Montana High Country line hub.

8 of the 18 fields this catalogue tracks are published for the 391TB. Not published: dry weight, GVWR, cargo capacity (CCC), exterior width, interior height, black tank, slide count, axle count, awning, air conditioning.

Sourcing rules: methodology.