I run 80 psi on my rear tires and 60 psi on the fronts, just like the sticker in my door pillar recommends. I always replace my tires with tires that have the same rating as the factory tires, because the suspension was designed with those tire ratings in mind.
2015 Jay Flight 32RLDS Elite
2012 Chevy 2500HD Crew Cab LTZ (6.6L Duramax/Allison)
Equalizer Hitch (1200# bars)