I decided to go today and attempt to register the Crown as a motorhome at the local DMV.
I had the title, which said BUS, the previous owners reg, which was a commercial reg from Oregon that said BUS and had a listed weight of 47,500lbs, and a bill of sale.
I filled out the TR-1 registration paperwork, the sales tax form, and handed them over to the clerk saying I wanted to register my Crown Coach as a motorhome. He could't have cared less!! Asked me seating capacity, I said 8, asked me weight, I said 25,000lbs, and I walked out with new plates and a motorhome registration not 15 minutes after I walked in!
I don't know if its always that easy in RI, but I had no problems, and could't believe it!!