You said this as a joke, but I found myself (at least for a little while) wondering whether this might be more efficient than having the wind turbine generate electricity and then have that electricity power the charger. But then I remembered that there is the cost of moving the relatively heavy vehicle on the merry-go-round and realized it wouldn't actually work.
What if you had a driveable wind turbine? They have solar panels on Priuses, might as well add wind to Teslas. The faster you drive, the more wind there is!
Now if you had a solar-powered Prius towing a wind-powered Tesla on the deck of a nuclear-powered carrier, you're just one creative accountant away from starting your own renewable defense company.
You're still converting to electricity somewhere, and moving around electricity is vastly more efficient than moving around mechanical energy. Always convert at the source.
Even when your output is mechanical it's hard to beat electrical wires. But here the output is battery charge; no contest.
Yes, I did say that as a joke, but I guess some took it too seriously. It would never work but it was the first image that came to mind, a merry go round of Tesla's.
