FWIW, I run max in my trailers and no problems at all w/ anything moving inside, ride is good and overall AOK. 1st 5er max was 80, and RV weighed 12,800 (out of 13,800 max weight). New RV, tires at 110, weight is 16,000 out of 16,000 (max weight). As we all know, all this weight isn't on the RV tires alone, but it's what it weighs when loaded up.
With my previous trucks (SRW) I ran max pressures and yes it made for a harsher ride w/o a doubt. Now w/ the DRW, I run PSI from door jam label and all seems to do well. Still can go up to 80 if need be, but don't need to. Fronts are 70, rears are 65. Makes sense to me.
IMO, better to air on side of caution. Semi tires are at 95 to 110 all the time.