Yes...I was wrong, it is not a 30 plus a 20 amp. It is like the electric feed to a dryer, electric stove, air conditioner, etc. in your house. AT SOME RV PARKS THE PEDESTALS ARE STILL WIRED AS 30/20 AMP LEGS. Check the circuit breakers on the pedestal!
But the main point...when plugged into a 30 amp (via an adapter) circuit or run from the generator remains the same....only one leg is "hot" so the 2nd a/c will not turn on.