Excellent responses here guys!
The good news is the solar kit I bought is easily scalable to 400 watts without any other modifications, so adding a panel (or three) shouldn't be terrible.
As far as losing food, you hit the nail on the head. We had what my wife and I estimate to be about $100 worth of food that we lost. To add insult to injury, the cost of an additional 100W panel is around $100.
This is a fifth wheel so no dash radio, no ecu's or anything like that. I guess I also don't know why it being an 04 means it has an inverter - ours doesn't. Between our family, none of the three campers have an inverter, and one is a 2015 model.