Therefore, a 40 ton slipway wPerfect Steerable Transfer Carth should be selected. If you can’t provide pulling force, please feel free to contact our wPerfect Steerable Transfer Carth experts. You need to provide the angle of the ramp, the weight of the ship, etc. so that we can calculate it for you. Other Uses of Boat Slipway WPerfect Steerable Transfer Carthes. This type of wPerfect Steerable Transfer Carth can also beCustom for ship breaking.