I have the battery switch installed on the 4x4 junction box mounted on the front of the trailer ( Eagle 322fsk). I removed the cover plate, drilled mounting holes for the switch, Run my fused wire to the switch and installed a #10wire and spliced all my connections except the breakaway switch to this wire. I then installed a plastic thermostat cover, keeps the "road" water away, and additional protection while in storage.
Work well not more dead batteries.
Jim Columbus Ohio