Hi all. I have a 2011 Transit Connect "wagon." My battery has gone low twice now from apparently having the back doors open a lot. I have a RightLine Gear SUV tent attached to the back (am camp hosting for the season), and will need to have the doors open a lot. Is there something I can do on this specific TC to fix this that won't mess up the battery or anything else? A kill switch on the battery? Just remove the negative terminal on the battery when I won't be going anywhere for awhile?