Glad you caught that before it got even worse. Time to nip that in the bud, Budd. Im flattered that I inspired that project and the pay off is that you discovered the damage. I had one small rusted galvanized plate up on the deck I replaced. I will be doing a fuel pump swap out soon and see if things are still dry since I did that project. Never had any water in the trunk or interior but moisture did get to that panel which I replaced with a new one.
I currently have a style bar which does double duty as a rear shock tower brace. Plan on putting in a real roll bar next year and will be extra diligent on preventing rust. You guys that have older installs on roll bars should check your rides out also.
Do you park it in a garage or leave it outside?
Good luck and let me know if I can be of any assistance.