Don't know about "aired to the max" advice though. Seems to me if the tires are way overrated for their application and being run at max air, the trailer is going to be receiving a VERY jarring ride, being launched to the moon every time you hit a pothole.
Re read my reply about "aired to the max" is aimed at his spare tire which most likely is the OEM load E tire.
When I hauled years back I had no reloads so the trip back to the yard was with a empty trailer and was the same as the miles out with a full load.
Trailers had 6/7/8k axles and weighed from 5500 up to 7600 lbs empty. No rough ride...no bouncing tires....no wearing the centers or other odd wear patters/etc. The OPs trailer may have 10k on the axles so he won't have to worry about his trailer going to the moon :) when he hits a pothole. Agree 110 psi wouldn't be necessary in his situation.