I'm with bigfootford. My 2016 Starcraft Launch came with a factory installed battery shutoff switch in the front storage compartment. But my slideout, tongue jack and breakaway brake switch get their power directly from the battery before the so called battery shutoff switch. Each has an inline 30 amp fuse.
I don't leave my battery installed when my trailer is in storage, but if I did, anyone could walk up to it and run the jack up or down, let alone a malfunction.
Actually, this came to light when I accidentally disconnected the breakaway switch and almost ran the battery down before I noticed it. Of course, I understand why the brakes need to be wired that way, but not the jack or slideout.