Maybe I am missing something here but the gentleman said he was 5'11 inches and 220 lbs...not 5'11" and 320 lbs. Any of Summits current stands have weight capacities up to and, in some cases, exceeding 300 lbs. I have the Revolution and find it very comfortable and easy to use. However, the Viper XLS is probably the most popular as the shooting rail makes it easy to use it as a sit down/stand up climber.

If I had to do it again I would probably go with one of their new backpacker models....probably the Broadhead model as it folds very flat, is just as light as the normal models and has the open front which makes it ideal for bowhunting. Since you both bowhunt and rifle hunt then maybe you might also consider the Bullet model.