Couplings for land vehicles; Trailer couplings; Trailer hitch covers; Trailer hitches; Trailer hitches for vehicles; Trailers; Trailers for hauling multiple automobiles; Trailers for hauling multiple cars; Trailers for hauling multiple land vehicles; Trailers for transporting automobiles; Trailers for transporting land vehicles; Trailers for transporting multiple automobiles; Trailers for transporting multiple land vehicles; Trucks and structural parts therefor; Bodies for trailers; Bulk hauling trailers; Car hauler trailers; Cargo trailers; Coupling heads for trailers; Equipment trailers; Full trailers; Land vehicle structural parts for heavy trucks.; Land vehicle structural parts for trailers.; Metal locking device for trailer hitch couplers; Refrigerated trailers; Road tractors; Semi-tractor trailers; Shaft couplings for land vehicles; Steps for attachment to trailer hitches; Structural parts for trucks; Structural repair parts for trucks, trailers, and other motor vehicles; Tractor trailers