I apologize if this is covered in a prior post ... I did look. I thought I would purchase an adapter to be able to use a Tesla charging station, although I've had no need to do that. I was thinking that it was just a passive adapter and that the cost would be minimal, so it would be nice to have it in the car in case I ran into an occasion to use it. Apparently these units are a lot more than just a plug-changing adapter, as the only one I can find is $256. Am I missing something?