Metal locking device for trailer hitch couplers; Mounting brackets for holding flags adapted for vehicles; Mounts for holding flags adapted for vehicles; Spare tire carriers for vehicles; Steps for attachment to trailer hitches; Tow trailers for use with aircraft; Trailer couplings; Trailer hitches; Trailer hitches for vehicles; Utility hitch trailers designed for use in hauling lumber, towing ATVs and transporting harvested fruit