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It's too bad you couldn't just hitch a secondary external battery pack to a mini-trailer hitched to the car for long distances. Roll into a station, unhitch the pack, swap for charged one, go on your way maybe 15 min later.

I know there are proposals for swappable internal packs, with automatic swap machinery at the station, but a trailer hitch and external plug requires a lower capital investment, and is much less intrusive to the vehicle design.

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I thought the whole problem with "just add more batteries" is that you drive up mass and thus reduce power efficiency, thus leading to a cycle of diminishing returns? I don't know how far along that curve a Tesla Model S is though.

Or for reaching the distant city a gasoline generator in the small trailer. Making it a plugable hybrid.

Or build said generator into the car and sell the whole thing for half the price of a Tesla :)

[x] http://www.chevrolet.com/volt-electric-car.html

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