We almost are never plugged in. I have a 2000 watt inverter, solar charger and regular charger (I disabled the "stupid converter") under the bed. The bed is in the front of the trailer so it's all close to the four batteries on the tongue allowing for short lengths of heavy wire to connect it all. I started out with a fancy automatic transfer switch, but changed it to a much more reliable manual two position - center off electrical switch. All outlets (including the AC which the inverter can't run but it's doesn't take a rocket scientist to simply not turn it on) are powered which makes life super simple. Wife loves being able to use the microwave. I run the refrigerator and water heater on propane. If we accidentally overload the inverter (which has only happened when I tested it to see what would happen) it simply drops off line until the overload is resolved. It took some time and money to put together, but this systems works well for us. You can get fancy and get an inverter/charger that is smart enough to take power from wherever you have it available (shore power, the batteries or both), but this isn't as economical as a little $70 switch in an electrical box.
