Till you scale it go with the maker's mark (No not the booze) The manfacturer's recommendation.
Then get it weighed and use the Tire Maker's inflation chart.
I say that because there are a few inflation pressures all but guaranteed to be wrong
1: The number on the sidewall (Actually it's right but you need to read the full sentence: Maximum load of xxxxx pounds at maximum pressure of yy PSI)
2: the pressure on the sticker (They do not know know much STUFF you have)
3: The pressure the tire dealer puts in.
On my rig.. turns out the sidewall is correct as loaded.