GREAT idea
i've seen these little tables and ones like them on expedition vehicles
specially the ones w/ the fan style shades that cover both the rear and side of the vehicles where their kitchens eminate from the rear of the vehicles like yours
yours is the 1st one i've personally seen on a swing out tire mount
the ones i've been seeing are mounted on swing out tailgates where the rest of the kitchen is in the back of the vehicle
for some it could be a combination of a drawer system and a swing out for folks w/ square back rigs ± ¿ ? !

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hope this will jar some mind sets
sw