a combination trailer and pontoon boat is disclosed in which the supporting wheels are attached to the boat by a confining track . this provides for the controlled launching and landing of the boat while the supporting wheels are fixed in place on dry land . ramps permit the loading of the towing vehicle onto the boat while both are on dry land . a towing structure moves beneath the boat during loading and off - loading of the tow vehicle and is then pivoted upward in the waterborne mode . the supporting wheels are winched from their position beneath the boat rearward and upward along the confining track in the waterborne mode . the combination trailer and pontoon boat is a towable , one vehicle ferry .