The Haul-Master Truck Bed Extender makes it possible to easily transport your 12 foot or longer kayak in your short bed pick up. The only improvement they might add is built in lights. I recommend getting some magnetic mount tail lights and zip tie them to the support. If the bed extender came with lights I would give it 5 stars.
It makes loading and securing the canoe in a truck equipped with a cap a breeze. The extender comes complete with all the hitch pins and cotter pins needed to assemble it. It is sturdy and secure and it can also be mounted vertically so that the canoe can be carried over an open pickup bed using foam blocks on the cab of the truck.
It's obviously not for everyone, but for people with pickup trucks it's well worth a look.