For conveniently storing items aboard an automotive vehicle, a storage tray is movable between a stowed position housed within a bumper and an access position wherein it extends through an opening in a rear surface of the bumper. At least one rotary support is actuated in synchronicity with the passage of said blanks the activation being via a drive member arranged on an adjustable bearing structure. The tubes extend away from and are fluidicly coupled to the header. Multidimensional motion of a bicycle component mount may include rotational, translational, and rototranslational motion with progressive elastomeric resistance in multiple directions.