This is a chain drive system with 4 x 13.6m skates mounted on the dock that elevate pneumatically and move the load in 1 shot. There are steel channels on the dock in the trailer floor that guide the skates. The in-fill floor between the channels provides a non-slip surface to support the pallets in the trailer after the skates have been withdrawn. The Hydraroll Trailer Skate will load a 13.6 meters semi-trailer in less than 4 minutes. This cost-effective solution for long-distance factory warehouse shuttle operations and loads up to 30 tons.