mount to the chassis frame of a truck or trailer. They stow folded beneath the rear of the vehicle to provide full access to the rear doorway when not in use.
RailTrac® models mount to the rear frame of a truck or trailer. They move straight up and down, providing a level ride cycle that runs aligned with the truck bed at all times. When stowed, the platform typically covers a portion of the rear doorway. Many models have platforms that may be lowered straight down to provide access to the doorway, or for dock loading.