Your questions may be better asked in the Tiffin forum. I'm sure you'll get plenty of answers there.
Good luck on your search!
Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS