I believe the Ford is the more rugged of the two chassis. But most of us don't wear RV tires out and most of us won't put the miles on an RV to where the Chevy might show wear that the Ford wouldn't.
The 2008+ Ford is better in axle capacity and braking than 2007- but the steering geometry wasn't changed that much if at all. I think improvements in handling might have resulted from more front axle capacity allowing longer wheelbase. Longer WB makes it possible to shift weight to the front axle, and more front axle load improves handling.