Or canoe, or anything else you are trying to get to the top of your car for transport. This is something I am marking to build. I have just about everything but the double suction cup. Which…are expensive ($17 each). So I may look for an alternative solution there. But since I typically have to get stuff up/down on my own. These would be nice to use.
http://www.instructables.com/id/Kayak-Car-Topping-Helper-because-They-Can-Be-Heavy/