Sounds like you have it figured out Paul. Those inverters will drain a battery very fast if you do much microwaving so be prepared to be running your vehicle to keep the battery charging. The inverter isn't made for long term power and high amp drains. They also don't drive motors very well. If you want more than occasional emergency use then get a generator for the camper. Assuming you are using a vehicle battery to run this, have some jumper cables handy to jump start your vehicle. Hate to see you get stranded.