In my head and on the road!
I towed the same trailer, about 6,500 lb., 32' bumper pull, with the same sway control hitch (a Reese Straight-Line, set up for the trailer) with my '01 and a new '11, the same afternoon on the same highway (test driving the 2011) in the same 35-45mph quartering crosswind. The drive was about 16 miles each direction.
The '11 was set up as close to my '01 as was possible.
There is a definite difference in the way the two trucks felt under those conditions. The '11 handled the trailer just fine, I am NOT knocking it. The anti-sway control never activated either. I don't think there was any problem with the truck. But, I was surprised how much more lateral movement there was in the front end each time I encountered a wind gust.