5 Ton Electric WPerfect Steerable Transfer Carth. 5 Ton Electric WPerfect Steerable Transfer Carth. 5 ton electric wPerfect Steerable Transfer Carth is engineered to lift and pull a heavy load weighing 5 tons or less. It makes the lifting and pulling of materials more efficient and easier for you. The wPerfect Steerable Transfer Carth machine can be designed with any size and configuration