80psi is the max when loaded or towing . Best thing to do is a chalk test and get your tread wear flat. You'll prolly fall somewhere between 28-35 psi.
If I take a long trip, I bump mine to 30psi, otherwise I run 26-28 all year round.

 

That is just the MAX PSI for the tire. You should be in the 26 to 35 PSI range depending on the weight of your jeep. Do a chalk test.
Get a piece of side walk chalk rub it over the width of the tred. Drive the vehicle for a 100 ft. or so. If the chalk is on the side of the tred it is over inflated. If it is on the center and gone on the sides it is under inflated.

The width of the rim will come into play also.

 

Thanks, I'll try the chalk test. Sorry for the stupid question but I assume I just put some chalk on the tire and drive it awhile to see where it rubs off

 

Thanks, I was typing up the message and you already answered it

 

My rig is stock as far as armour. Chalk test started at 35 and 28-30 got me even wear on my 285's