The question has come up on a RV park requiring a driven grounding electrode at each pedestal, for instance a 200 amp feeder suppling 4 pedestals 3/0 copper are the feeders with a #6 equipment ground feeding in and out of the pedestals of course the grounding electrode system has been established at the service equipment. based on 551.75 that all the equipment in the park be grounded as per 250. in 250.32 refers to two or more buildings or "structures" from a common service which requires the driven electrode at each structure (RV site), a little long winded but has anyone come across this senario and it be called this way