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At 3750 pounds your wheels are rated at 110 psi.As for as psi per tire, you could go by the chart but the advantage to 110 psi is you will have less friction on the road which means less heat and heat is the biggest cause of blow-outs on the road. 100 psi is probably the least i would go with and you might get a slight increase in ride quality as the tires will flex a little. I don't worry about my tires wearing out faster with more air as my tires will probably time out before they wear out. This is my 2nd set and they wear great. As for as China dumping them on the U.S. market, The tires i bought in February were cheaper than when i bought them in March 2014. With the possibility of a trade war with China we could very well have these tires increase in price even before 2019.
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