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I run newer tires at max or max+. Older tires get the "properly inflated" treatment plus a few pounds. The tires on my trailer get about 40 lbs. They are not new and were run at about 30 lbs before I bought it. They have some cracking on the corners, so I choose to play it safe. The DOT on the tires says 174 so they might be from 04. My car tires are at 50 psi and the truck is normally at about 50.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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