I also asked the factory about this being a new owner of a 2017. They said to put the stereo switch to house. For me this did not answer my question. I had a dead chassis battery after purchase and replaced it the next day. I also ordered a Trik-L-Start Ultra TRIK-L-START Starting Battery Charger/Maintainer
to cure that issue. It vampires power from the house batteries to maintain the chassis battery. While the seat is off I'm getting my solar setup for my future install of it as well. The onboard battery charger in the power center will not trickle down enough not to harm (cook) your house batteries. I recommend a off board battery maintainer for this.