In Australia you have to pay registration per vehicle even though you can only drive one at a time. This means people will buy a big vehicle that they might need occasionally instead of having a big one and a small one.
No. I just mean that it would make more sense to pay a fee to drive any car rather than rego for each. That way you could have a small car for around town and a bigger car for when you need to go further afield without having to pay two lots of registration fees.
This logic is usually beat out by the existence of rental services. Is a couple hundred bucks a year to rent a truck when you need it really more expensive in the long run than owning and fueling $50,000+ truck year round?