[Charby]

I am looking for some info on tire inflation. I had Trailer Kings ST205-75-14 - Load C that had maximum rating of 50 psi, which I maintained. I upgraded to Goodyear Endurance of same size which have Load D with a maximum rating of 65 psi. My dual axle trailer has a dry weight of 4300# and cargo carry capacity of 2230#, which is way more than I use. My question is what pressure should I keep tires inflated at as not to create a hard ride, but not soft to increase heat in tire. I'm not sure what my alloy rims are capable of but high pressure valve stems were installed.