Turbo backfire

Only indication anything was wrong was a slight noise when accelerating and a smell like like wires and plastic burning. I pulled over, left engine running and walked around coach then slid underneath and checked for anything unusual, nothing, no noise, no leaks no smoke. when I pulled into the RV park I found my jacks doesn't work and the lights in the bedroom and televisions don't work. It was the next morning that I checked the air cleaner compartment and found a lot of melted plastic. My wife hears everything and she didn't know anything had happened until I told her something wasn't right when I heard a very quiet hum and then the smell. Never any loss of power, in fact it ran like a scared deer.

I WANT A NEW NEWMAR GASSER, You think this is a good excuse. Beautiful machines but when you get my age you just don't buy a new anything unless it's a new bottle of pills.:)

what were the symptoms? if it was a loud pop followed by a loss of power it could be something as simple as a charge air cooler hose coming off or something a lot more serious like a sudden failure of the turbo (broken shaft or broken impeller) hope for the simple one
good luck

It's not backfire, it's called "bark" and you want to avoid it at all cost although in some instances it can be hard to avoid. It can end up snapping the shaft if it happens enough.
Basically it's a sudden reversal of air pressure and direction when you lift your foot suddenly.