As usual my actual experience is questioned BUT. That trailer has for several years had 235X75X15 Goodyear Wrangler tires on it, I just walked out there to make sure, with 40 PSI of air in them. I don't know what pai is. This is a 1999 Pace 32ft enclosed car trailer that weighs about 14,000lbs loaded and I have towed it all over the country like this. I also have a 20ft Featherlite with the same tire, air pressure, etc on it although it is lighter. I am not asking anyone to agree, just saying what has worked for me for a long time. Carry on and safe travels.