Abstract: Amphibious air cushion vehicles equipped with drum rollers. The vehicles may be tractors or trailers. Either the air cushion or the drum rollers may support the vehicle entirely or the load may be shared by the two systems. A single or multiple power plants may be provided. The drums may be adjustably positioned for use and non-use as may the air cushion. The drums have multiple flexible air compartments, are highly deformable in use and have external tractive elements functioning on land as well as in water.