Pistonbroke
Active VIP Member
I would start out at 45 PSI all the way around...and you could probably run a little less in the rear if you're running empty in the box. Rotate them every 5-7000kms
I run around 60-65 front and about 40-45 rear when empty. Seems to ride and wear well around there for me on my 3/4 cummins 4wd