Truck Repair: tire pressure, correct tire pressure, rears

Question
Hi Mike: I have a 34' RV, and I was wondering about correct tire pressure. The tires are 8R19.5 (dual on back. The tag inside the cab says to use these tires at 60 psi, but the tires themselves say 110 psi (for single) and 100 psi (for dual). I was wondering what the correct pressure should be? (75 psi ?) Thanks for any help.
Randy.

Answer
At my work we run the tires at 5 psi Under the rated psi on the tire itself.  On your rears I suggest running them at 95psi for the duals.  If you have mis-matched tires with different psi's run all the tires on that axle at the lowest psi tire's rating.  If you have any other questions, please feel free to ask..MIKE