loading base
Upper loading base: An upper loading base connects to the load edge (at the height of the bumper) of the luggage compartment. The boot tray lies on top of the boot floor.
Lower loading base: A lower loading base is lower than the load edge of the luggage compartment.
Variable loading base: With a variable loading base, the depth of the floor can be changed. Variable loading bases are often foldable or can even be removed.