So I decided to go with to go with the Vision 7.5 Heavy Hauler and the Hercules 19.5 265's all around, so what would you advise running them at? They are rated to 123 psi max, but I'm pretty sure I...
I'd go to the OEM website and find the PSI/Load table (most have one) or find the (different manufacturers call it different things) "maximum sag rating" or some such.
The 1st document will have a list of weights and recommended PSI's to run the tires at. The 2nd outlines how distorted or out of round your tires can be (or how much axle sag) is allowed or recommended.