DB, great project -- thanks for posting! I never would have thought about insulating the pass-through, but that makes a lot of sense.
2012 Fun Finder X-139 "Boondock Style" (axle-flipped and extra insulation) 2013 Toyota Tacoma Off-Road (semi-beefy tires and components) Our trips -- pix and text About our trailer "A journey of a thousand miles begins with a single list."