Wiring chases, IE fishing walls, etc+ Cougar 24.4 5th

Sorry, its not real practical. 2x2 walls dont leave much room for large holes. As for the solar? Thats pretty doable. Figure out where you want to mount your controller, fish the wires down from a hole in the roof. I actually was able to run them down next to a holding tank vent pipe. So all I needed to do was cut a hole in the wall, feed the wires down, connect to the controller, and then feed the wires down to the converter.