Keystone 276 EFS, Super clean and very popular rear living floor plan Keystone Cougar 276EFS 5th wheel. Towable with most half ton trucks. Only 6,980 lbs. unloaded. Has large super slide out. Many options and extras. Length: 28' 10" Sleeps: 6 UVW: 6,980 lbs. GVWR: 8,320 lbs. CCC: 905 lbs. Fresh/Grey/Black: 45/56/28 Gal. LP: 13 Gal.