I just got the new Nitto NT420S tires on my truck, and was wondering if anybody knew the proper psi to maintain. Most are 28-32, but after that large of an investment, I'd like to know the right number. Thanks in advance

 

I'm running 40 psi in my 305/45-22 Falkens. I'd try to stay in the 35 to 40 psi range.