My plan is to ...
I have USAA for my car, when I attempted to add the bus to my policy they asked for the VIN. USAA's system would not accept the bus's VIN#. How do you get around THAT I have no idea. My plan at this point is to follow warewolf's Vermont title/tag plan - get an RV title in hand - and try to work from that point. Insurance drives me crazy. The whole concept of liability insurance is completely vehicle independent IMO - liability is created by people, not machines. If I rent a car, or borrow the neighbors car - and I get in an accident - my liability insurance pays for any liability caused by my culpability (whether I'm at fault). It has nothing to do whether I have a school bus in my driveway.
No matter where you go .... there you are!