[JRTJH]

All you need for the LP detector is a steady 12 VDC source. You can obtain that from any direct 12 volt line under the trailer. I'd suggest, if you move it to the bathroom wall, lower the coroplast on the closest side, locate a reliable 12 volt wire, tap into that, drill a small hole in the floor and run the wire up, into the trailer to power the LP detector. If there's a closet nearby, you don't have to be as "precise" in measurements, but chances are you'll have more than one hole in the floor. Plug the others with silicone (top and bottom) to prevent water from getting to the foam inner core of the floor.