For those of you who are interested in tire problems, TPMS, tire pressures, etc. I suggest you visit Roger Marble's blog (links below). He is a tire design and quality engineer with over 40 years experience. His blog is a wealth of information. It doesn't matter which RV website I visit there are always questions about tire failures, pressures, and TPMS systems. If you want a professional's opinion I am not sure you could find a better person.
Roger's answer to what inflation pressure for a trailer would be something like 'use the manufacturers inflation tables AFTER determining the real world weight of each tire on your trailer, use the heaviest weight measured, then add a 10-15% safety factor.'
Happy reading!
RV Tire Safety: TPMS
RV Tire Safety: Trailers
RV Tire Safety: Failure