Shrp-
Chevys have IFS in the front. They do not flex as well as SFA. Chevys can BARELY tuck 285s, most rub with this tire under them. Dodge's and fords tuck larger tires and have a solid front axle in the front giving them more flex, keeping more weight evenly distributed onto the tires. Taller tires = more ground clearance. This combined with the added flex to the suspension gives you better offroad capability. Yes stupid drivers get stuck more often, but with equal drivers, the truck with the bigger tires, most clearance and flex will do better offroad. There really isn't a question there. I don't think the weight is ever really concidered when comparing full size trucks to other full size trucks. My truck weighs 7600 lbs.
This isn't meant to bash chevys. My next truck will probably be a chevy, right now I have a dodge obviously, I was just stating I would miss the offroad performance. Chevys ride nice and make a nicer family rig IMHO.