I would rather not comment on who the manufacturer is at this time as I am in the process of negotiating a price for the refurbishment. I will post what I am 99.9 percent sure is the cause and how to correct it when these negotiantions are complete. In the meantime please check your sleeper's components (fridge, Microwave,Lights,inverter, A/C fan) periodically. I now know that these items should be checked just as you check the fluids under the hood. Wires and components get vibrated and bumped while running up and down the road. These are easy to pull out and visually check from time to time. This truck was purchased new in January 2002 is now just an empty shell of fiberglass, still drivable, but not for running over-the-road loads.
My best advise now is to make sure your Fridge, Microwave, Lights, ect. are all turned off when you are out of the truck for more than a few minutes. In my case it only took the heat source a few moments to ignite the interior which lead to the fire progressing to the rest of the sleeper. All this happened while the driver was inside the house getting a change of clothes together for a run,(maybe 20 minutes). The driver came out to get in the truck and it was fully involved. The damaged was confined to the sleeper and Cab. It's a good idea to keep an additional fire extinguisher accessible from outside the the truck.
Another word of advice, Don't try to save a little money by buying the smallest Fire Extinguisher required. You'll feel pretty bad when you see the flames extinguished down to a little flicker and when you mash the lever for that last squirt, there's nothing left. You stand there and watch the flicker reignite the combustible gases because you saved $15 by getting the smaller extinguisher.
I still worry about what would have happened if the driver had been asleep in there when this caught fire.