Some folks will install the second A/C unit on a separate 120VAC 20AMP circuit that they can plug into the camp ground 20AMP Service which most have...
We use the 20AMP Service pedestal all the time with our trips. In the winter months this runs our extra oil-filled heaters...
The 20AMp Service from the pedestal does not take away from your 30AMP service. It has its own circuit breaker on the campground pedestal.
If you can't find a 20AMp service receptacle to plug-in to then go ahead and plug into one of your 15AMP receptacles and turn off alot of other things if you have too allowing you to run both air conditioners.
There is also another solution which is starting to become popular and that is one of those portable air conditioners. They just plug into your 15 AMP receptacle and need to have a close by window for the exhaust to go thru. These A/C units can be a 5K or bigger but are great for one room like the bed room...
A couple of choices here...
Roy Ken
