On my F150 when towing I ran max of 44psi when I had P's on it. Switched to E's and ran 50psi. Non towing I ran the door sticker IIRC was 34-35psi.
On my 3/4 ton I run the door sticker for non towing. 65f-45r. Towing I run 75f 80r. Depending on frequency of towing I sometimes leave the towing psi in. If I'm going every other weekend I leave the towing psi in. Anything longer than two weeks between trips I air down. I'm retired so my driving is way less than a working guy so I don't put more than 100-150 miles on the truck between camping trips.