I've seen a canoe loading guide that mounted on a receiver hitch. It has a telescoping leg that lifts up to roof height, and two rollers on the top that roll along the gunnels of the inverted canoe.

I jury-rigged a kayak rack off my buddy's receiver hitch one time. He didn't have a topper, so we used a piece of pipe coming up from the receiver, and it tee'd about roof-level. Then it had two pieces of 2' pipe that carried the boats. We just used a regular Yakima rack on the cab. Worked well since the bars were spaced so far apart. Just the tee and pipes were a bit floppy though--if I was making a permanent setup, I'd put in diagonal braces or gussets between the main leg and horizontal bars.

Since I have a topper that rarely gets off the truck, and a permanent rack on it, I always use it for carrying my boats.

(I told you guys I went crazy with that digital camera last week!)

Shawn
> Has anybody ever seen a rack for hauling a kayak that would slide into a
> receiver hitch on a pickup truck, something along the line of the ones
> made to haul bicycles.