I plug in my trailer a couple of days before a trip so we can stock the refrigerator/freezer. The trailer is a 30 amp. system. I run an extension cord from a regular house outlet to the trailer usin...
The Dogbone type (the adapters with the cord) do not strain the outlet as much.. With the "puck" type (All one piece) the 30 amp cord has "Leverage" and physically strains the outlet.
now.. If you are using a 10 or 12 GA extension cord and putting the adapter on the ground.. Don't matter.. only matters if the outlet is in a wall.
I use a Puck with a 3 light tester to see how badly the park technician screwed up the box.
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