It could have been the pedestal's receptacle that was bad and simply transferring the heat to your plug. I changed the plug on my GD cord a week ago. The one that was on there was not looking too good. I replaced it with one of the yellow plugs with the handle that makes disconnecting a piece of cake. No more wiggling the plug. BTW, with the GD stop collar on and this new plug it does fit in the coach.

Jack, pulling less than 40A a leg is a huge load. All air conditioners and hot water heater must have been on the same time the chargers were trying to charge well depleted batteries. That's well over 8,000 watts which can produce a lot of heat if there's much of any resistance in the plug or receptacle.