You don't tell us anything about your truck: year, 4wd/2wd, options, engine, etc. You don't tell us anything about what you're towing: make, model, weight, what else you have in your truck, etc. We know almost nothing about the conditions under which you're towing, so it's difficult to give any advice.
The more you share, the better your help will be.
With my 2005 F-150 SCrew 4WD, I would run 75 psi with my E-load when towing a 6,800 lb trailer and around 1,500 lbs of cargo (including tongue weight). When not towing, I would drop psi between 45 - 55.
Every time you use an apostrophe to make a word plural, a puppy dies.
TV: 2019 F-350 Lariat 4WD CCSB 6.7 PSD 3.55, 3,591 lb payload
Former RV: 2018 Rockwood Mini Lite 2504S
Former RV: 2007 Fleetwood/Coleman Utah
Former TV: 2005 F-150 King Ranch 4WD SCrew 5.4L Tow Package