A houseboat manufacturer based in Tennessee, Harbor-Master has been producing water-based accommodations since 1980. Ranging in size from 34 to 56 feet in hull length, the fiberglass vessels created by Harbor Master houseboats can be moved by diesel or gasoline motors. Great Houseboat for your summer entertainment. The 1987 Harbor Master is powered by dual 270 hp, 350 CID Crusader Engines. Seller advises the Harbor Master sleeps eight people. Roomy dinette and galley area with forward sleeping area. Upper helm and deck area great for viewing the scenery and soaking up the sun.