A cargo supporting floor has two or more groups of movable slats attached to drive feet which drive cylinder assemblies reciprocate. The drive cylinder assemblies are at least partially in front of the groups of slats, the slats being attached to the upper sides of the drive feet with movable components at least partially below the upper surfaces of the slats, the movable components being above the lower surfaces of the slats and/or above the upper surfaces of the drive feet.
