We generally use two pieces tail roller U brackets at a time to fit both ends of the tail roller shaft.These two items combine with a rear roller to form a kit,which is used to assemble on the tail of the truck hoist to help with rolling when cable is pulling a container.Tail roller kit can also minimize damage to customer's property when the hoist is raised and loading or unloading the container, allowing the tail to get in touch with the ground and reduce drop distance.