I can be done but not in all situations. I have a 50 amp coach but both A/C's, with the second being a prior owner install, are 13.5 BTU capacity and will consume about 1300 watts or just under 11 amps when operating. When I'm on 30 amps with both going the fridge and water heater go on gas and no microwave, hot plates hair dryers and such if both A/C's are on. I'm effectively doing manually what an EMS does automatically.
I have volt and amp meters so I can manage my AC and DC power usage along with hard start capacitors on both A/C's to help reduce start current surge. So far no problems. It also helps to have a simple coach. The only lock out is the slides can not be extended unless the emergency brake is on. No limits regarding electrical loading.
