I agree with the above post from downtheroad. All of that paranoia is a waste of time. Proper tire maintenance, plus knowing what the actual weighed weight of the RV is (once) and staying close to that is good enough.
I inflate the TT tires to the sidewall pressure and am done with it. In my case that means 50 psi. if it is a couple psi over I leave it alone - this is not rocket science. Under inflation leads to heat and failure so why bother with lower pressures? The tires are rated for their sidewall pressures and given you are below the rated load and speed on the tires you are fine.
On the truck I use 2 pressures - a little over the pressure on the door jamb (30 psi) when not towing, i.e. 35 psi because I like how it feels / handles at that pressure and I get better mileage. I also used that pressure when I had my hybrid, but after one short trip with 35 psi and some squirm while pulling my new trailer (below) I upped the truck's rear tire pressures to 40 psi (max is 44psi) and pulled 750 miles from GA to Houston perfectly. This on P-rated tires. I have been driving around town with the 35/40 pressures and it feels just fine, so I will stay with that setup from now on.
