WHY
A flying car .
The boat-car never sailed off , even though it worked well.
The concept of having two uses , for one registration, doesn't work that well .
' motorhomes ' versus ' car & caravan ' , still works in favour of leaving the van on site , while sightseeing, in the car . ( or loosing your camp-spot, as it is vacant, while sightseeing in the motorhome ) .
spacesailor