The Thule 887 SlipStream kayak rack was designed and developed by Thule Racks specifically for those users concerned about their kayak making contact with the rear of their car when loading a kayak onto the kayak carrier. With the Thule SlipStream kayak racks users are guarenteed that kayak to vehicle contact is eliminated while loading and unloading the boat due to the 887 carrier's unique adjustable sliding base bars and rear roller position, Yes, it includes a rear roller for the easiest loading of any kayak - one person can do it with virtually no effort! The included adjustable front and rear kayak saddles allow positioning of kayak at bulkheads regardless of base roof rack system location. Works well with all types of kayaks. This kayak carrier can attach to both Thule square bars and elliptical Rapid Aero bars, Thule Xsported Truck Racks, Yakima round crossbars and virtually all factory installed roof racks with cross bars. Includes all hardware, two heavy-duty straps, buckle bumpers, and a pair of Thule 855 Quickdraw ratcheting tie-down straps for securing kayak bow and stern to vehicle.