minimum tire pressure for non towing.

Open the drivers door and look for the build placard.. a sticker that gives you weights and tire info. Now I'm not a tire expert but what is on the tires themselves is MAX pressures cold carrying a load. I always use Max pressures when hauling a load that is branded on the tire itself. Being a Dually the rears are even more tough to get to.. right?...that inside tire valve is a pain to get to. But where I'm going with this is....I run mine at MAX psi when loaded as branded on the tire then I air them down to those posted on the placard for normal use. So say your running 80psi (as mine are branded) max load with the RV but the placard says 65 front and 50 rear respectively unloaded. So you have a new truck with the stock tires... that answer is right there on the sticker unloaded and on the tire as max loaded. Now if your running e rated tires, which a Dually should have, I would not run them at max unloaded which is what your asking. The ride is terrible..air them down to the posted sticker...at least that's what I do...good luck!
Where did you find this "FORD" recommended tire pressure for towing at?