2011 Keystone RV Alpine 5th Wheel Series M-3500 RE. Keystone four seasons trailer. Year 2011. Trailer has been very well kept and maintained. Hidden television unit with full surround sound built in central vac unit granite counter tops stainless appliances electric or gas fireplace on suite bathroom as well as a spot for optional washer and dryer. Plenty of storage and kitchen space as well as lighting options. 40 feet length with power awnings and slide outs., Specifications, Max Sleeping Capacity 4, Number Of Slideouts 4, Length (ft-in m) 37' 8'' 11.5, Base Weight (lbs kg) 11530 5230, Carrying Capacity (lbs kg) 3970 1800.8, Hitch Weight (lbs kg) 2345 1063.) 15000, Heater (BTUs) 42000, Holding Tanks, Freshwater Capacity (gal L) 66 249.8, Gray Water Capacity (gal L) 82 310.4, Black Water Capacity (gal L) 50 189.3, Propane Capacity (gal lbs) 14.2 60, Water Heater Tank (gal L) 12 45. Inventory number: R118287V