So you can use the dash radio, and often times, the DVD player without having to have the ignition switch turned on and draining the chassis battery. It is not just Thor that does this. My prior coach was a Forest River Class C and it was wired the same way.
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054