2027 Keystone Cougar355FBS

Keystone publishes three weights for the Cougar 355FBS: a shipping weight of 11,802 lb, a carrying capacity of 2,098 lb and a hitch weight of 2,000 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 Cougar 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, 76 gal gray and 76 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 ST235/80R16H; 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 7 Cougar floorplans profiled here, this one is the 5th by Keystone’s shipping weight, in a range from 9,674 lb (260MLE) to 12,499 lb (360MBI). 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 19 Oct 2026 from Keystone’s own floorplan page for the Cougar 355FBS. That page carries no model year, so the year comes from the roster page that links it, which lists the Cougar 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 355FBS differs from the other eleven Cougar fifth wheels. 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.

• Carrying capacity (Keystone’s term), 2,098 lb: second-smallest of twelve, between the 26RKE (1,800 lb) and the 316RLS (2,108 lb).
• Shipping weight (Keystone’s term), 11,802 lb: third-heaviest of twelve, between the 364BHL (11,625 lb) and the 350LLK (12,040 lb).
• Hitch weight as a share of shipping weight, 16.9%: third-smallest of twelve, between the 23MLE (16.5%) and the 316RLS and 360MBI (17.6%).
• Hitch weight as Keystone lists it, 2,000 lb: sixth-heaviest of twelve, between the 316RLS (1,900 lb) and the 295RDS (2,010 lb).
• Length, 39 ft 3 in: longest of twelve, level with the 350LLK and 360MBI; next is the 364BHL (39 ft).
• Sleeping capacity, 6: shared with the 23MLE, 26RKE and three others; of twelve, three smaller and three larger, nearest the 260MLE, 295RDS and 350LLK (4) and the 29BHL, 360MBI and 364BHL (10).

Next to the 364BHL (2026 page), the nearest lighter floorplan by shipping weight, the 355FBS is 177 lb heavier by shipping weight, has 277 lb less carrying capacity, has a hitch weight 380 lb lighter, is 3 in longer and sleeps four fewer; the two publish the same exterior height, fresh tank and grey tank.

Next to the 350LLK, the nearest heavier floorplan by shipping weight, the 355FBS is 238 lb lighter by shipping weight, has 862 lb less carrying capacity, has a hitch weight 240 lb lighter and sleeps two more; the two publish the same length, exterior height, fresh tank and grey tank.

Keystone lists 10 Cougar floorplans for 2027. 7 have a complete Keystone figure set and no existing page here, and are profiled, from 9,674 lb to 12,499 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 Cougar 316RLS, nearest on the published figures. It differs on 2 of the 5 fields both publish (this plan first): length 39 ft 3 in vs 35 ft 8 in; hitch weight 2,000 lb vs 1,900 lb. They match on sleeps, fresh tank and grey tank.

All 15 Cougar floorplans: Cougar line hub.

8 of the 18 fields this catalogue tracks are published for the 355FBS. Not published: dry weight, GVWR, cargo capacity (CCC), exterior width, interior height, black tank, slide count, axle count, awning, air conditioning.

Sourcing rules: methodology.