Since our trailer weight does fluctuate (water or holding tanks full or empty) I run the tires at 80 psi. This way I have a little leeway with loading.
If You do weight each tire and go by the pressure required, You will have to add air if You fill the water tank ( unless it was full when You went on the scale). It's just too much of a hassle for me, I just regularly make sure there's 80 psi.
Don't forget to check the spare.
John
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