I would strongly suggest checking out the Chippewa Wedge Loc Brute. Large platform (about 26 x 30) and hangs in seconds, rock solid. You can order them with to differant seat heights. It has a 475 pound capacity. They also have a very simple self leveling feature. They are awsome hang-on stands!

Check them out: www.chippewawedgeloc.com

Good Luck!