Second, I was reading that since the inside tire carries more weight than the outside tire it heats up more resulting in a higher PSI thereby making it more stiff than the outside tire causing the inside tire to wear faster. It was suggested to run 2 or 3 PSI lower in the inside tire to account for this. Thoughts??
I can find this easily enough but while I'm here...how do you rotate 6 tires?
Keep tire pressures equal across the four rear tires. They will wear better. As far as rotating tires the owners manual has a nice picture of how to rotate a dually's six tires. However, you may find that many dually owners never rotate if the tires are wearing equally.