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Our previous 5th wheel had 5200 lb axles and at weight of around 12,400 with 10K on the axles. A ran Michelin XPS Ribs for 7.5 years and Brdigestone Duravis R250 for 4 years. I started at 65 PSI based on the OEM china bomb Kenda LT235/85R16E tires. I notice a still more wear on the Ribs outer rib, so I up pressure to 71 psi and tread wear for very even after that. Sailun makes the S637 is bother ST235/80R16G and ST235/85R16G. Choose the size that works for the trailer and 80 psi will be more than you really need for the load.
As a side note, Michelin and Bridgestone could have easily slapped ST in the RIB and R250 and rated then to 75 MPH, however they would not have appeal to the OEM manufactures because of cost. That is exactly what the CEO of NuWa told me, when I challenged him to use the XPS Rib in place of the Uniroyal Laredo LT.
Chris
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2019 Laredo 225MK for travel. Bighorn 3575el summer home in Washington, Park Model with Arizona Room for winters.
2015 RAM 3500 SRW CC SB Aisin Laramie
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