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Random thoughts are my favorite. I'm planning to re-purpose the floor/face lines to route to front and back instead and hadn't considered adding some extra power as I will probably need it.A random thought. Since you're doing a camper build, have you thought about adding an extra heater core for the rear of the truck ? It should be fairly easy to install one with an auxiliary fan. It could also have a factory style vacuum control that's connected to your dash panel. As I mentioned before, just another one of my "Unsolicited suggestions". Enjoy your day.