Depends on vehicle, rim size, etc. Best way to check is teh chalk test. Draw a line with chalk across the tread and drive up an down the street (minmizing turns) and adjust until the chalk wears evenly across the tread.
BTW, my 35x12.50r15 SSRs on 15x10" wheels seem to wear best at 30psi
35psi sounds close for a mid sized swamper, maybe a little less in the rear though. I run my 39.5" TSL's(2500 QC LB 7000lbs+)at 32 in the front and 29 in the rear. If you had 14.50 or wider swampers I think you would find that you would need to run the front a little lower in pressure because they are so hard of a compound.
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