We have done this before with the extension cord to the pedestal. The problem some times is the pedestal is shared with another site next to us. (This campground has a lot of sites like this) If a tent camper shows up on that site, they usually take all the 20 amp outlets and get irritated when we want to use one of them. Last year in the middle of the night, a late camper arrived while we were sleeping. The 30 amp outlet on their side of the pedestal was not working, they unplugged our shore cable and plugged theirs into it. Our cable mysteriously moved into the outlet that was not working. Our fridge was set on electric not auto. We lost all our food. The next morning was pretty ugly. The park ranger told them they had to replace our food or leave......they left.