I carry two boats on there sides, in fact I used Ross's form to make my saddles. They work great. Ross is right about loading, I put mine on top of a cap on a full size 4x4 and although I can do it by myself it scares me every time. I guess I shouldn't worry to much since my Wife dropped her Guillemot off the top of her car (a Thule rack) with nothing more than a few varnish scratches, but it still scary.

BTW Ross's form is floating around with someone else as a kind of sharing deal amongst us BBS reader's. I don't remember who it was off hand. I'm terrible with names.