these tires are 125L rated so from what this shows they are 3637lb at 75MPH max
https://www.herculestire.com/support...-speed-guides/ My old tires had a max of 95 cold and I could see on the TPMS that is would reach 115psi when driving. So I think with my trailer being around 12,500LB that running at 100PSI should be a good fit.