Trailer couplings; Trailer hitch ball covers; 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 bicycles; Trailers for transporting land vehicles; Trailers for transporting multiple automobiles; Trailers for transporting multiple land vehicles; Bicycle trailers; Bicycle trailers (riyakah); Bulk hauling trailers; Car hauler trailers; Cargo trailers; Equipment trailers; Garbage hauling trailers; Horse trailers; Metal locking device for trailer hitch couplers; Recreational vehicles, namely, fifth wheel trailers; Recreational vehicles, namely, towable trailers; Refrigerated trailers; Steps for attachment to trailer hitches; Tow trailers for use with aircraft; Tow bars for trailers; Toy hauler trailers; Tractor trailers; Utility hitch trailer designed for use as a portable picnic platform equipped with cooler and grill