Most if not all ac's run on AC power , you would need a very large and expensive inverter and battery bank to run your air conditioner on a DC converted to AC power source. Most people that require the use of there AC without hookups either have one 3000 watt generator or a pair of 2000 watt generators with a parallel kit which is what we use . We also have a 100 watt solar panel that keeps the house batteries charged most of the time and LED bulbs have been installed to use less power when dry camping. is your trailer a 4 season trailer if not and even if it is your going to being using a lot of battery running your heating furnace blower motor (DC) if your out below 20 degrees. good luck with your adventure