need some motor home advice

I bought a used pull behind years ago in Illinois pulled it to Casa Grande Az. The manufacture had nailed thru the 120 wiring years earlier when building it. The trip jiggled it around to where it shorted out inbetween the paneling and the outside metal one night. My buddy and I smelled it and put it out but what a pain to put it out inside the wall.
I highly recommend having a couple fire extinguishers on board.