I' m getting a new stand and have narrowed it down to either the Summit Goliath or Viper XLS. The only differences I see with the Goliath is it weights 2lbs. more, has a weight capacity of 50lbs. more and the seat is 2" deeper and 1/2" thicker. In most catalogs it cost $40 more. I was wondering if the main rail(?) is any wider or deeper or any other differences and why it would have a 50lb. higher rating. I am 6' 3 and weigh 225. Thanks for any help.