I'm trying to set up a track day for Roadster owners. I've gotten good cooperation from Shannonville Motorsports Park, but they don't have enough capacity to install half a dozen NEMA 14-50's. We'd be looking at upgrading their electrical service to 400V, transformers, etc. The electricians are already at $8k and we haven't even got a quote from the power utility yet for the new connection. So... any alternatives? Is anyone aware of a mobile generator truck affair that (a) would have that kind of power, (b) produces power clean enough that a Roadster will accept it, and (c) can be rented for a day or two?