The tire sticker located on the left side of your trailer towards the front lists the size AND tire pressure recommended. All these fancy formulas and weight compensations are unsubstantiated B.S. Follow the manufacture's sticker. If it calls for 80# cold, then inflate them to 80# cold. It ain't rocket science. Oh, balance your tires, too.
2013 Palomino Columbus 320RS
2007 Dodge RAM 2500 6.7 Cummins
Reese 15K manual slider
M.I.L. in Florida for good!!