It seems to me I was told [years ago] to never plug in a portable electric heater in the coach. One should always use an extension cord and the power post at the parking pad.

I watched an older gentlemen use the 'cord to power post procedure' last night. They were in an 06 Marathon, I'm almost sure those have toe kick heaters, but the old gent wanted more heat I guess. Cold here in Eugene, OR.

Is this something I have misplaced in my memory bank or is it an old wives tale?