For the first time in 9 years of traveling all over the country we had a need to park our RV remotely in a campground and get around in a car. We were in the Minneapolis area where our daughter lives ...
I've read lots of people doing a similar thing - not just with class B's, but all the way up to A. Towing a car has it's problems and some folks don't like to do it at all.
Some rental companies will bring you a car - like Enterprise. So that can make it a very little hassle experience.