2027 Keystone Alpine Avalanche Edition366LS

Keystone publishes three weights for the Alpine Avalanche Edition 366LS: a shipping weight of 14,300 lb, a carrying capacity of 2,300 lb and a hitch weight of 2,625 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 Alpine Avalanche Edition 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 75 gal fresh, 83 gal gray and 49 gal waste, as Keystone lists them. Fresh water weighs about 8.3 lb per US gallon, so a full fresh tank is roughly 622 lb on the road before anything else is loaded. The tire size Keystone lists is ST235/80R16G; 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 6 Alpine Avalanche Edition floorplans profiled here, this one is the 2nd by Keystone’s shipping weight, in a range from 12,200 lb (321RL) to 15,695 lb (381DL). 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 4 Nov 2026 from Keystone’s own floorplan page for the Alpine Avalanche Edition 366LS. That page carries no model year, so the year comes from the roster page that links it, which lists the Alpine Avalanche Edition 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 366LS differs from the other five Alpine Avalanche Edition floorplans. Most distinctive first. How these ranks are worked out.

• Shipping weight (Keystone’s term), 14,300 lb: second-lightest of six, between the 321RL (12,200 lb) and the 380LT (14,508 lb).
• Hitch weight as a share of shipping weight, 18.4%: second-smallest of six, between the 380LT (18%) and the 321RL (19.8%).
• Length, 40 ft 10 in: second-shortest of six, between the 321RL (36 ft 6 in) and the 379MB (41 ft 11 in).
• Hitch weight as Keystone lists it, 2,625 lb: third-lightest of six, between the 380LT (2,605 lb) and the 379MB (2,980 lb).
• Carrying capacity (Keystone’s term), 2,300 lb: shared with the 390DS; of six, one smaller and three larger, nearest the 380LT (1,992 lb) and the 381DL (2,305 lb).
• Sleeping capacity, 6: shared with the 381DL; of six, one smaller and three larger, nearest the 321RL (4) and the 379MB, 380LT and 390DS (8).

Next to the 321RL, the nearest lighter floorplan by shipping weight, the 366LS is 2,100 lb heavier by shipping weight, has 500 lb less carrying capacity, has a hitch weight 205 lb heavier, is 4 ft 4 in longer, stands 2 in taller and sleeps two more; the two publish the same fresh tank and grey tank.

Next to the 380LT, the nearest heavier floorplan by shipping weight, the 366LS is 208 lb lighter by shipping weight, has 308 lb more carrying capacity, has a hitch weight 20 lb heavier, is 1 ft 6 in shorter and sleeps two fewer; the two publish the same exterior height, fresh tank and grey tank.

Keystone lists 7 Alpine Avalanche Edition floorplans for 2027. 6 have a complete Keystone figure set and no existing page here, and are profiled, from 12,200 lb to 15,695 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.