Originally Posted by Bassdogs
Look on the actual tire sidewall and fill to max psi listed.
X2. The tire manufacturer's pressures should be used - stamped on the sidewall. Just be sure to check pressures when your tires are cold. The pressure will increase when they are warm.
That said - I like to check my tire pressures when I pull off the road in a rest area so I can see how much of an increase in pressure the tires have when they are heated up from travel. That way, if I have to add air while I'm traveling, I have a reference point of how much pressure should be in them when they are warm.
2015 Jay Flight 32RLDS Elite
2012 Chevy 2500HD Crew Cab LTZ (6.6L Duramax/Allison)
Equalizer Hitch (1200# bars)