Without knowing the exact tire brand/size, it*s hard to give a definite number. The average of most light truck tires is a recommended 35 psi with a maximum inflation pressure of 44 psi. The psi could also very based on how you plan to use the vehicle, like on-road vs. off-road. For typical, on-road driving 35 psi should do the trick.
〉 Answered on Aug 20th, 2009 by Denise Koeth, Managing Editor at Tire Review Magazine