I have seen countless RVs on the highway with a small vehicle hooked on the back.  Having something more usable when you get to your destination makes a lot of sense.  What about if you have a boat?  How are you going to get around when you reach your next port?  Why, bring a car with you of course!  This ship was in the harbour at Bristol while we were visiting.  The car was sitting on the deck, ready for use whenever it was needed!