Being 4 hours south of you, I am essentially in the same boat. I have my batteries in a rack made by Overkill Solar and they connect to a master Perko battery switch with Pre-charge, as designed by Filter Guy. My battery pack comes out with the disconnection of the +/- cables. Do you use your inverter for AC pass through when your battery is out of the van, a question because if not, your inverter was turned off when you removed your batteries, no? Your plans, as noted before, are a thing of beauty.