Whatever other people do, I strongly suggest that you do not inflate any tire 15 psi above the tire's maximum.
I also suggest reading the load capacity information on the tire sidewall to determine if the tire is sufficient for the trailer.
1979 Boler B1700RGH, pulled by 2004 Toyota Sienna LE 2WD
Information is good. Lack of information is not so good, but misinformation is much worse. Check facts, and apply common sense liberally.
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