Bump in hopes for a response...
After testing my batteries individually, I found that several of them were "bad". I wasn't sure on the age of the batteries, as I bought it used, so I decided to go ahead and make the small investment of replacing all 6.
As excited as I was after replacing the batteries, all excitement came to an immediate halt, as the problem did not go away.
I have tested the F-N-R switch, and the ignition switch, both were good. After reviewing the expensive parts that were replaced above, I think my next steps are to try the OBC bypass temporarily to rule it out, and then try bypassing the tow/run switch.
Any other thoughts or suggestions?