Welcome to the Forum from Western New York State! Congratulations on the Seneca!
I've read there's a few things that are required to keep power to them for safety, such as the LP/CO detector and smoke detector if it's hard wired.
I have to keep a maintainer on my F150s battery if I'm not going to drive it for a while, there's that much parasitic drain. Voltage will drop to 12.2 volts after 3 or 4 days, and the battery's a year old next month.
Every day's a learning experience, though sometimes not what we expected.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley