RVCampsite only 30amp - can we run AC in the Class A

Absolutely! You can run other stuff as well. I suggest trying to get any other major draw shut down first and then start the A/C. After the A/C is up and running the amps will settle down and you can go about using 1 or 2 other high draw items as well. If you have an amp meter keep in mind that about 24 amps is going to be max for any extended period of time before the parks breaker trips.

You can run both ONE A/C and the converter/charger on 30A provided the charger and other equipment amp draw is limited. My charger can draw 11A AC with low batteries and/or a lot of DC power. However I can reduce the charger capacity down to 10% if required. It's not a big problem as the 30A CB will trip and then you know to turn some stuff off.

We've been on 30A recently at several CGs and we are careful about using high draw appliances like A/C, HW, MW, etc. Hair dryers are another popular high draw appliance.

It can be done--but it is best to monitor the voltage. At 107 volts I shut down the roof air.

Then I add my autoformer and the voltage goes back up. I limit the input amps to 24 (80% of 30).

Yes you can run one A/C with a 30 amp dogbone connector. I've done it several times.

You should not have any problems running one AC unit along with other items. I would not try to run 120 volt water heater, washer/dryer.