I wasnt addressing the battery capacity as I knew that it would involve a deeper more involved discussion. But.....I currently have a couple deep cycle 12v batteries that when they poop out, I plan on upgrading to three 12v batteries. Not sure of their group size until at that time either since I may have to move things around for space.
As for the inverter size, now understanding that the larger the inverter, the more drain on the whole battery system just to run one item, thats good to know. Recharging the batteries would be via a generator and/or plugging in when possible.
All I was really going for is to be able to turn the TV on for a little time at night for kids, and maybe run the coffee maker and/or microwave if needed during the day without having to start the gen for a 10 minute run. I have no intentions on investing in an expensive solar package nor a bank of batteries which requires a home equity loan to afford. We like to camp when we can but are the "A typical" camper who gets to enjoy the RV/trailer when work, school, and busy life schedule allows. If I was retired and spent more time in the RV than home, I'd have no problem investing in what offered the best solution and comfort. ;) Maybe an inverter isn't worth it right now.....:h