If there was ever a definition of the modern hippy, then this must be it: a husband, his wife, and their dog driving across a great country for no particular reason in an electric car towing a trailer with solar panels on top. It doesn’t get any more hip than this.

And still, wouldn’t you just love if you could drop everything you were doing right now and swap places with them? Going on a 6,000+ miles (10,000 km) road trip with …