[jonsen]

The batteri should go in a trailer. Swap the trailer. The car itself could be smaller. Luggage could go on the trailer.

[tppiotrowski]

Would make swapping easy but reversing with a trailer is not easy.

[jonsen]

Self driving trailer shouldn't be difficult.

[bduerst]

Trailers are non-starters for most vehicles.

Better to bring the batteries to charge the cars when they need it: https://www.sparkcharge.io/