Bob, I am a big believer in the proper inflation for the job at hand. If you look at the door jamb on most cars, they will have a psi for different weights (depending on passengers etc). under/over inflation can wear out the tires too quickly. Under can wear out the sides, but over can cup the tread and wear out the tread center. Under gives better traction, and over gives better mileage. If there is not a psi rating for the job at hand, I look at the profile of the tire and make a judgment call. I make sure that the tread is flat on the ground and the side walls are sitting up properly. My hot rods never have multiple psi settings, so I had to learn how to "judge" it.
That's how I do it
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Doc Weaver '98 Freightliner FL60 pseudo toy hauler
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