Is there any Supercharger at the Thunderhill Raceway Park???
Otherwise, I would camp at the 'Corning' Supercharger, 35 miles north, to take a pick of those beasts!
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You want to see them up close? Here's my suggestion:
The Thunderhill calendar says there is a "Private Event" at the 2-mile track today and tomorrow. That means they will almost certainly be there tomorrow as well. Go there very early in the morning... Like 7am. Then go find the electrical outlets situated between the two covered areas. They will very likely be there charging. The PD version was black with 20 inch stiletto wheels. Take a bunch of pictures and post them here.
There may be a guy at the gate. Just tell him you are there to observe the event at the 3-mile track (which is where the plugs are anyway).