Mark,
Is all of the plastic inside gone or just on the doors? If it is the doors you might be able to get a door from a salvage yard and fix what ever else is wrong. But given the age of the unit, you might just be better off replacing it. I have seen plenty of TT's with 110volt only fridges. In fact one of the guys I camp with bought one of the FEMA hurricane trailers, surplus, it only came with a 110volt fridge. He just plugs it in for a day or so before he is ready to go then plugs it in again when he gets to the campground.
Aaron
