One thing that seldom gets much press is the manner in which cold tire pressure is related to the load on the tire. Every tire has a pressure to weight ratio denoting how much air pressure a tire needs to carry a given weight.
A good many folks, ourselves included air our tires down to 50 PSI when running empty to soften the ride and the change in ride quality is dramatic. When we air them back up to run with our camper, we air up according to the pressure table I obtained from Michelin for our tires as the weight on our tires is well under the pressure on the door sticker.
There are several other ways to adjust pressure to weight available on the Internet. Running higher than require pressures gains us little other than a rougher ride in our F350 which already has what we regard as an exceedingly rough ride. But, as Mike noted, pressure should only be taken when a tire is cold i.e. driven less then 10 miles and never reduced when after a tire heats up.
Steve and Andra
2012 F350 6.2 gasser SRW LB
Fab Fours front and rear in case we run into a rhino
2019 Northstar Laredo SC