You'll learn to manage as you go along. How you manage depends on the weather. If it's really hot, you'll need to shut everything down to keep the A/C (s) running.
As stated, you can turn the refer and water heater to gas. You can also turn off your battery charger during the day and save several amps and then turn it back on in the evening.....make sure you leave yourself a note.
During cold weather camping, you can plug an extension cord into the second outlet at the shore power box, run it into the coach through a window or other opening and power an electric space heater, freeing up the rest of the 30 amps for other uses.