The Thule 847 Outrigger II lift Assist is a brand new design that makes it even easier to load and unload boats alone. Great for the lone paddler, the extension bar provides the extra hand when loading a boat by yourself. Attaches to the Thule standard base rack load bars only. Retractable bar extends from inside load bar and provides a pivot point for loading boats on tall vehicles, including vans, trucks, SUV's, and wagons. Lift one end of the boat onto the extension bar, lift the other end onto the canoe or kayak carrier and now you can easily reposition the first end onto the canoe or kayak carrier. Easy to use directions and a lifetime warranty!!!