a semi - trailer for is converted for transporting motorized golf carts and side by side recreational vehicles which are loaded onto the floor and an upper support level with detachable two tier loading ramps and receivers . the upper support level includes transverse shore beams connected to the logistic posts in the side wall of the semi - trailer which then supports and stabilizes a foldable floor system defined by pivotal panels which hinge upwardly into a stored position . the ramps are carried in a rack under the trailer floor .