How to compare tires for replacement and needed pressure

Too much for me. My rules of thumb are:

1. Step up one load rating over the placard, either at delivery of a new trailer, or when you swap out the first set of tires.
2. Stay away from STs whenever possible, no matter the tire size.
3. Always run at max sidewall pressure unless running extremely light (like completely unloaded), then drop 10 lbs.

Works for me.

Lyle