The Sticker on my Dodge 3500 Dually said 60 Front and 65 for the rears when loaded, vice 40 and 35 unloaded. Took me a long time to air them up from unloaded to loaded with my 2 Gallon (great for car tires) compressor. Similarly, when I picked up my used Montana, most of its tires were in the upper 50s, and one was in the low thirties, versus the 80 lbs PSI recommended and that took a long time...
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