12 Trailer hitch couplers and replacement parts therefor; metal locking device for trailer hitch couplers; vehicle towing equipment and structural parts thereof, namely, hitch balls, ball mounts, reducer bushings, receiver tubes, pintle hooks, namely, hooks used to pull or attach a cable or trailer, pintle mounts, hitch adapters, step bumper hitches, hitch pins, safety chains, S hooks, namely, hooks used to attach a safety chain from a trailer to the hitch of the towing vehicle, quick links, namely, links used to attach a safety chain from a trailer to the hitch of the towing vehicle, tie downs, hold downs, rope rings, tie loops, and clevis slip hooks; vehicle towing equipment accessories, namely, hitch ball covers, receiver tube covers, hitch ball wrenches, and tie down straps; parts for trailers, namely, shackle straps for trailer suspensions, U bolts, U bolt tie plates, leaf springs, spring bushings, cast equalizers, spring hanger kits, electric brake shoes, electric brake assemblies, disk brake pads, wheel bearings, wheel bearing kits, bearing protectors, seals, spindle parts, replacement hub kits, grease caps, namely, protective coverings for the center of a wheel to keep dust and grime out of the wheel bearings, and plugs for grease caps, namely, plugs used to close an opening in a grease cap through which wheel bearings can be lubricated; trailer jacks and replacement parts therefor; parts for vehicle wheels, namely, lug nuts and wheel bolts; spare tire carriers for vehicles; cargo carriers for vehicles; structural parts of vehicles, namely, bed caps; side shields as structural parts of vehicles; land vehicle accessories, namely, accent trim, battery trays, and battery cases; and automotive and land vehicle parts and accessories, namely, bed mats and tailgate mats