Cavie, no. I could not find any fuses that were labeled reverse polarity. There are two that had been labeled LP and WP. I assumed the WP was for the water pump and could not think of what LP meant. However, I did check all fuses on the panel as well as the fuses on the converter. Could those be the polarity fuses?
I hooked my car up to the batteries to let them charge a little so I can charge my phone, etc. The converter is now running as well as the lights, outlets, etc. Guess that wasn't the issue.
A camper repair gentleman is supposed to be coming by tomorrow afternoon. Hopefully he has some good news. Again, thank you all for the help.
Roy