My Sailun Tires went on the same rims as my Trailer Kings that came with the unit. My Trailer Kings were same size as the Sailuns - ST235/80R16. Check the back of the rim where 110 PSI should be stamped indicating the Max PSI for your rim.
I did the same as you - checked pressure every time I moved and drove 60 MPH or less. I just started worrying about the weight on the tires and the consequences of a blowout and insurance claim. Then my wife said, "Just buy them". I'm One Lucky Guy!!!
Good Luck.
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Bill & Mary Van Nuys
Leavenworth, KS
2014 3735MK Legacy, Sailun 637s, TST 507RV TPMS, 2 Battle Born 100 AMP Lithium Batteries, Slide Toppers
2015 Chevy 3500 LTZ, 6.6L Duramax 4WD, CC, LB, SRW with Allison Transmission
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