[redpoint5]

It's impractical because it's easier to have a friend or family member that has a car to swap with for those infrequent longer trips.

It's also more practical to have a 2nd car that is a gasser.

I can't think of a reason to have a genset or pusher other than it's a neat concept and fun project (or you already own the genset). Either that, or someone is extremely unlikable or untrustworthy, yet still wants to own only an EV, but still take longer trips, and not hassle with renting a car, or stopping to charge periodically.