Your 30a Main breaker load is NOT just the AC unit, and if not tripping the 20a, and blowing cold, your AC is FINE. So what else is on the 30a, you say? Refrig, Coffee, MWave oven, AND Your CONVERTER/ CHARGER, and that sneaky bugger can be pumping high amps into your battery, if it is low, or if the battery is defective. TIP: iF YOU HAVE A RUN DOWN Coach battery (from use) allow it to charge for a while on shore power/ gen BEFORE turning the AC unit ON.
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