2004 Mainship 400 Trawler One of the most desirable models of the Mainship Fleet. With twin Yanmar diesel engines, 2 stations, 2 staterooms and head. A true veteran of the Great Loop, you will not find one better equipped for a hassle free cruise around the Great Loop.Update: New Canvas, Bimini, Complete Enclosure, and Exterior Buffed and Waxed.