joem789 wrote:
But my biggest question there would be how to connect a solar charge controller to the existing battery while leaving the 12V camper wiring connected for use? Does the controller basically go in between the batteries and the controller? Or does it all just hook together onto the battery?
Solar connects direct on the battery. NO other changes needed.
Controller will have two terminals to connect the panel and two separate terminals to connect to the battery. Controller close to the battery for best results.
Before:
Battery ---> RV
After:
Panels ---> Controller ---> Battery ---> RV

(load terminals are generally not used for RVs)