There is something very wrong with the 30 amp breaker or the coach wiring if the branch breaker dedicated to the air conditioner never trips. You are talking about the 30 amp breaker in your coach and not the one that may be on the power pedestal at the park where you are hooked up, right?
Just in case there are other parasitic drains in the electrical system of your coach, try turning OFF all the branch breakers that do not go to the air conditioner and see if it behaves any differently...
If not, changing out the main 30 amp breaker makes good sense to me since it seems to be tripping at much less than its rating.
Chuck
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