A/C breaker trips whenever ambient temp is high?

Filter is clean. It's just a ultra thin piece of foam.
Breaker is a dual 15/20 amp. The 20 amp is what trips.

If the ambient air is below 90-95 or so the A/C will run fine indefinitely and keep the trailer cool.

Need to find the easiest way to measure current draw without tearing too much apart. Hopefully the breaker box is easy to gain access.

Will try replacing the breaker as that should be easy and cheap to try.