member 30 a smaller diameter pivot tube respectively 40 and 42 is installed within and extends beyond each end of each of the central tubular upright supports 36 and 38 and comprises the base member of the upright assembly first and second uprights respectively 44 and 46 are welded or otherwise immovably affixed to the respective pivot tubes 40 and 42 of each of the upright supports 36 and 38 with opposite first and second diagonal braces 48 and 50 extending from the opposite ends of the two upright supports 36 and 38 to the upper ends of the uprights 44 and 46 this structure allows the upright assemblies to pivot or fold downwardly adjacent to the central base member 30 for compact storage as shown in fig3 with the second upright 46 and its attached upright assembly illustrated in an intermediate position during the folding or unfolding operation each upright 44 and 46 and associated assembly is locked in its fully deployed upright position as shown by the first upright 44 and assembly in fig3 by a two link locking arm 52 extending between each of the first and second end components 32 and 34 and their respective attached first and second uprights 44 and 46 the various lowermost members i e the first and second ends 32 and 34 of the base member 30 and the two upright supports 36 and 38 and their corresponding pivot tubes 40 and 42 are preferably provided with padding material 54 sleeves collars etc thereon in order to preclude marring of the finish of the automobile or vehicle a each of the two uprights 44 and 46 supports an opposite.