Wow, a flood of information since I last checked on this. Thank y'all very much for coming through.
Yes, I mixed up my terminology and apologize for that. I said converter simply because that's what it says on the front of the unit, "Power Converter". However research on that model shows that it does convert from 12v to 120v, but does not have the ability to charge batteries. When I said "inverter", I was referring to the unit that goes between the solar panel and the batteries to charge them.
I'm going to look into the buddy heaters. No more than I expect the run lights and such, I could get away with using the pickup batteries for running the lights and use the buddy heater for heating if need be. For that matter, I only really need the heat in the evening and morning when changing clothes and prepping food, so the buddy heater might allow me to forget the solar system completely at this time.
I'm going to read back through all the posts more carefully now and start doing more research. I just wanted to take a minute to say thanks for the help so far.