So the rim is stamped with the weight - 1870 - but I don't see any PSI rating.
Found this on another trailer site. Not sure if this is accurate but it sounds pretty good. Haha.
"Reading back over this thread I see that a rim with 2150# of load capacity is standard Original Equipment (OE) with some of the trailers using LRC tires rated at the same load capacity. When a rim is clearly marked with it’s load capacity a PSI rating is not necessary because the load capacity of the rim dictates it’s maximum PSI rating. In other words; Any tire used on that rim can reach the maximum load capacity of the rim with 50 PSI of air pressure. Any cold air pressure greater than 50 psi will over pressurize the rim.
That statement does not rule out using tires with potentially higher load capacities than the rim. It does rule out using more than 50 psi.
Tire and rim maximum load capacities are pre adjusted for the effects of thermal equilibrium which is predictable for all tires/rims under normal conditions."