The way to find out is to air up to max pressure.
Run chalk across the tread and drive around the block.
Let air out untill the whole tread(chalked section) wears evenly.
I usually let 10psi out at a time.(Many trips around the block.)

... motor in front heavy on 2 tires, 75 to 85 your choice in front , if U notice a difference u are the princes laying on the pea

just kidding, backs, unloaded U want traction and there are alot of tires with like no weight, 65 is fine, When loaded run em ALL full, low weight in super singles under load can and does cause catastrophic side wall failure, dont run em low for long when U need to air em down for traction, High speed on these extreme off road tires causes extreme tire failure, many on this site think these are high speed tires, no they are not, they will give U the service they were designed for if U let them by proper air and speed , 99% of all the failures of tiress and vehicles are human error, many wont believe it but its true, like my tires got me stuck, is the classic i read on this site a few times, always good for a laugh

less air more wear,to much bad too, good to ask... like everything in life these are guidelines for U, your driving and abilities will require U to adjust...

Good luck,