My old large, permanently mounted, front tire chock made it impossible to use my trailer fully, without disassembling it and removing it bolt by bolt. With the Quick Detachable Transport Bar, I can slide the chock into place when I hauling my bike, and remove the chock when I need the trailer for other things. Once in place, the chock is securely held in place with a single pin, that requires no tools and best of all, no crawling under the trailer. It is perfect if you are like me and need to use it as a utility trailer as well as transporting your motorcycle.