Its the Maximum period !!!! NEVER go over the MAX rating written on the tire. So it should set under that pressure if filled cold. Anticipating it will go up when running. To be sure some trailer people check them after running for a while.
BUT....If the tire gets hot while running (like the link FF put up) the tire is likely underinflated so you add some. But not beyond the MAX written on the tire.
This is why on cars you go by the sticker insdie the door, not whats on the tire.
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