Battery disconnect on a 5'er

I have a battery disconnect switch mounted on the wall inside one of my locked storage compartments. It is a marine style, so all you have to do is turn a knob to kill everything. Mine turns off everything in the trailer, except the solar panels that are wired direct, to keep the batteries charged. One advantage is that when the trailer is in storage, and someone breaks in (which has happened twice) the crooks can't find much in the dark.