This drawing shows what happens when you use a RV30A-50A adapter when at a 30AMP only pedstal service location. You can see that both legs feeding circuits is paralleled in the adapter plug. This will apply 30AMPs of power across both RED and BLACK zones of circuit breakers.
It will be up to you to not use some of the higher wattage units like the second air conditioner etc otherwise you will trip the camp ground 30AMP service circuit breaker...
You can use either the front or the rear air conditioner but not at the same time. Just flip off the circuit breaker for the one not being used.
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just passing on info
Roy Ken