Thank you for the replies. The electrical shop called this morning. (I did put a new plug on it) The insides are melted and in pieces.
what do I learn from this?
Do not attempt to use maximum amperage (supposedly provided) or exceed as the autoformer will allow it for an unknown time without tripping breakers? ( 80% continual use is max, thanks CA Traveler.)
the autoformer quality plugs can stand much more heat than campground pedestal receptacles, eventually burning out the campground receptacle and sending a short to the autoformer, (which destroys it)?
The innards of the autoformer could not take the heat, shorted back to the pedestal plug?
No question that clean tight connections with proper size wire is a must when attempting to maximize amperage provided. Winter camping with all the heaters going in the campground would probably exceed air conditioner use in summer.
I;m guessing that PI is progressive industries and the unit is a surge guard? No one, even at the RV place has heard of an autoformer, but I would like to get something in the line. Over the years I believe the autoformer has worked very well. Next trip South, I'll get another.