Wheelchairs; Bicycle-mounted pet seat; Bicycle trailers; Car seats for pets; Cargo trailers; Coupling heads for trailers; Multiple-pocketed carrier for personal items specially adapted for attachment to wheelchairs; Pet carriers adapted for bicycles; Pet safety seats for use in vehicles; Pet strollers; Stroller covers; Tow bars for trailers; Trailer hitches; Wheeled, collapsible carts; Standing wheelchairs