WHAT!!! There's a lot more rusty gm trucks around here than any others under 10 years old. I actually got my main Ram from Traverse City back in 06. I did end up putting rocker panels in it 2 years ago, but it's 22 years old so I think it earned them.
I know GM trucks rust also, as i have owned 5 OBS chevy/gm trucks and tahoes, and have done rockers, cab corners, and repaired doors/tailgate, but there is no way a dudge rusts less. Obviously how you take care of the vehicle plays a role in it, but Dodge is notorious for rotting out before the pay off in MI.
But any GM 06 or older will have rusty rockers in its life, theres no avoiding that haha.