Call Procomp and ask. Every tire manufacturer should be able to tell you what pressure to run for the aplication, even loaded or unloaded. For example, on my 06 Screw with 35" Toyo M/Ts, I was told by their customer service to start with 45 psi, and adjust accordingly by gauging tread wear. I now run them 43 psi front and rear. If I have a 6000lb trailer on the back (600 lb tongue weight), I have to pump up the rears to 65 psi. They should be able to tell you all that info at Procomp's customer service line.
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