I have them on my 2500. When I first got them, because I pull a large Fifth Wheel, I put the tire pressure at maximum, or 80 lbs. I soon figured out that was too much considering the strength of the sidwalls; my truck wandered all over the road, especially pulling the trailer. I experimented with lower pressure and ended up at about 65 lbs. This gave me a good foot print on the road and the sidewalls just barely bulge. Now, the truck runs true.
These are great tires, and they wear very well.
Just remember to avoid running too much air. In this case, more is not better.