Black Widow Heavy-Duty Motorcycle Carrier with Aluminum Track SMC-600R Safely and easily transport larger motorcycles the Black Widow Heavy-Duty Motorcycle Carrier with Aluminum Track. Designed to fit in any standard Class III or IV 2” hitch receiver, this carrier includes an integrated seven position adjustable wheel chock, reverse anti-rattle device, four integrated tie-down points, a 5/8” hitch pin, and an extra-long ramp. The loading ramp stores on the carrier for quick and easy access when loading and unloading your bike.