Well, the trailer now has a set of Maxxis D rated ST205/75/15 tires. Both the RV dealer that did the work as well as the tire store that did the mounting insisted that trailer tires must be inflated to their maximum sidewall pressure. Since I suspected that they would feel that way, I printed out a copy of both Maxxis's & Goodyear's RV & Trailer Tire Inflation Pressure/Weight Tables, but they wouldn't let me out of the shop without 65psi in the tires.
I know that there are believers in both theories, and I suspect the "inflate to sidewall pressure" comes from larger trailers that are at the tire weight limits, but I don't understand why there are inflation tables from both manufacturers if the shops won't use them. Maybe because they have no idea of what the trailer actually weighs?
In any case, the bearing have been checked, repacked & brakes cleaned & adjusted. All the various spring projects in the trailer are done so I'm ready to go!