I am not towing now but for about 36 years I always inflated my trailer tires to the max indicated on the sidewall. I never once in all those years had a blowout or any other type of tire problem other than a couple of punctures.
Unlike car or truck tires, a RV is usually pretty close to the tire weight limit all the time. Add in all the twisting and dragging when turning and you have a very bad situation for the tire. Hence, my recommendation is to follow the guidelines of most of the manufacturers and fill to the max as indicated on the sidewall.
Barney