If it didn't have a max pressure stamp, did it have a max weight stamp on the wheel? If the max weight was up to the LRE weight, or more, I believe the max pressure is 'automatically' up to the corresponding LRE pressure. Metal valve stems above 65psi is the standard for most. Mine have a weight stamp only that I can't read without removing the wheel.
Good luck
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Wxman
2018 Passport Elite 19RB (sold)
2021 Jayco Eagle HT 274CKDS
2017 Silverado Z71 5.3L 3.42 gears(sold)
2021 Sierra 2500 4x4 CCSB SLT (gas)
E4 16k/1.6k hitch
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