I am a big guy also. I bought the Summit Goliath.
http://www.summitstands.com/catalog.aspx?catid=Goliath2006 Summit Goliath SS
The Summit Goliath&trade SS is a full featured stand that is also full-sized.
This stand ends your search for a great climbing and hunting stand that fits a bigger hunter. The full-sized hunter will appreciate a beefed up top section able to support up to 350 pounds. Get a look at that top section, it’s wider than normal which means you’ll stay comfortable so you’ll be able to hunt longer. Our RapidClimb* stirrups mean you don’t have to bend over to pull on boot straps and this stand is built tough and TMA-tested so you can finally feel secure that you’re in a stand designed with you in mind.
Relax, the Summit Goliath SS is all the treestand you’ll ever need...and more.
* Patent Pending
Shares the same versitility as the Viper SS - A great gun or bow stand!
QuickDraw™ trigger system is quick and quiet.
2" wider seat climber gives you extra room.
Weight capactiy increased to 350 pounds.
New two piece seat buckles are height adjustable and allow you to remove the seat quickly.
Solid front bar makes climbing easy and works well as a gun rest.
Thick Pads cover the arm rests and front bar so you are totaly comfortable.
Enclosed Packet includes 4 point safety harness, RapidClimb Stirrups, Summit Skin, All neccesary pads, hardware, ropes and straps.
5 year limited warranty.
Weight: 21 lbs. (Aluminum Construction)
Tree size: 8 to 20 inches
Seat height: Adjustable
Seat Size: (base) 18" wide by 12" long (back rest) 12" wide by 20" long
Overall Size: 20" wide by 36" long
Platform Area: 20" wide by 28 3/4" long
Seat Frame size: (inside) 21.75" wide by 26.5" long
Weight Limit: 350 lbs.