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We run 125 cold in the 17.5" G114 H Max pressure per sidewall label. There are a lot of opinions on this one.
The main reason I chose to run max is the amount of stress the sidewall is under during dynamic loads varies so much that any recommended pressure VS wt chart may be safe for a lab test but under real world conditions it just may not be enough. Heat is greatly increased with lower pressures. And, heat is one of the main causes of tire failure, along with overloading. Which go hand in hand. This is backed up by many tire industry experts as was shown to me at a seminar I attended last year.
I'm not sure if I could tell the difference in the trailer ride with a change in trailer tire press. But, I choose to allow the suspension and air pinbox take care of that and keep the tires as close to max as I can.
JMHO
Cheers,
Bill
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