Here's the ticket:
http://www.harborfreight.com/200-lb-...and-38778.html
One of the reviewers says he uses for his kayak.
The only down side is that it's zinc plated steel. Water will inevitably get on it so I'll probably spray paint a few layers of rustoleum paint on top to mitigate the rusting.
I'll let you guys know how it works out!