Reply #19: Lost your mind, sorry :-)

[krispos42]

How many can they be driving at once? One per driver!

Actually, owning multiple special-use vehicles should cut down on emissions because the family might have, say, two subcompacts as daily commuters, a minivan for family hauling, and a pickup or SUV for bad weather, cargo hauling, or recreational trips. And an RV probably isn't any worse on consumption than the fuel required to fly a family someplace and rent a car and a hotel room.

It would also be punishing the parents if their adult offspring lives with them while working or attending college or whatever.

The off-road vehicles mentioned (boat, ATV, snowmobile, jetski, etc.) all pay taxes when they are registered and when they burn gasoline. Your rep can just raise registration fees on non-automotive vehicles and call it done.