let me add to this. did have a water line to ice maker break. did have water on floor inside MH. inside house 30 amp breaker tripped.
we replaced it, the power cord plug, gfi in bathroom (which that did not trip either, nor breaker on CG box).
when we plug in just one heater at 750 watts, power cord gets hot. Granted, the heater was sitting in water but did not get wet and we plugged it back into the outlet that it was in when this happened. But now, if we plug in either heater, power cord gets hot.
we are trying a different outlet now to see what happens.