Have an '08 2500HD. It's a good truck but I have already broke down first time I towed my RV (6000 lbs). Fuel mileage is terrible. 13 -15 mpg. When I tow this little RV mileage drops to 8-9 mpg. My father's '05 is twice as good on fuel with a load 15-17 mpg. They really missed the boat with this new emmissions package. Knowing what I know now I would not have bought this truck.
Interior comfort, rides much better than '05 2500HD