Pulling Trailer with 2014 Ram 2500. Balance question.

I personally feel that you really shouldn't air down your tires unless you know how much additional weight you have riding on your rear axle and consult a load book to figure out how much pressure you truly need to meet that minimum. Otherwise, I would keep it at 80 psi. What kills tires is flex. Higher pressure reduces flex as the tire rotates which also reduces the amount of heat generated in the tire which ultimately causes separation and a host of other issues.