My technique is similar to pianotuna's. When boondocking I do the following:
1. Fridge and water heater on propane
2. Disconnect converter. I isolated my converter's power supply to its own AC breaker that I switch off. I also have air conditioner, electric water heater, and microwave breakers switched off to avoid accidentally running them (too much load for my battery system)
3. I plug my camper's shore power cable into the inverter's AC outlet.
4. Turn on inverter, now all outlets are live in the camper.