Trailer tire pressure

Your trailers vin/ info tag should have the weight rating stamped on it. Example gvwr 12000. That's what mines rated for. So if you have a dual axle trailer, four tires, then each tire should be rated at 3000lbs at Max inflation. The tire ratings are on the tire.
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On the subject of trailer tires, I suggest a heavy tire like a load range E or higher. That'd be a 10 ply and take about 80 psi.

I believe ratings go like this:

A----2 ply
B----4 ply
C----6 ply
D----8 ply
E----10 ply

Even if you're not hauling super-heavy loads, I'd use as heavy duty as I could get. Myself, id rather have a set of used 10 plys than new light tires. I know people who haul a lot that use 16 plys.