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Less load, less air pressure. Okay, seems reasonable. Seems most (if not all manufacturer's) have inflation tables based on tire loads though you gotta search for the information. Does anyone actually use the tables for their rigs based on real-world known loads? I'll bet the reality is they're far and few between. No wonder its seems trailer tire failure is such a common issue on various marine and RV related forums.

Mine is pretty easy. I know my loads are relatively close (about 90% of) to the maximum rated load for the tires so I use the maximum rated air pressure. I don't put enough miles on any of my trailers to worry about excessive center tread wear and running a bit too high pressure seems a lot safer to me than running a bit too low.

The vehicle manufacturer's pressure ratings for automobile tires are based on the loads front/rear those tires are subject to as well as compromises in ride quality and vehicle handling. Also, those pressure recommendations are only good for the model tires the vehicles came equipped from the factory I've been told from the service department at the dealership which makes sense.