BigSwede
The Credible Hulk
Well maybe not...it broke on me during the last trip. That's only about 14 days of trail use before breaking...
For the big guys: http://www.amazon.com/Kijaro-Dual-Folding-Chair-XX-Large/dp/B004C0KHIY
These things are really sturdy (for a folding chair), roomy, and are rated at 400 lbs. Fortunately I don't weigh quite that much, but am 6'3" ~280 lbs, and this chair works well for me.
To their credit, Kijaro is apparently going to replace the chair. We'll see how this one lasts.