For anyone going to Metal Ponies rally from a state with no moped plates, email me for the holy grail.
Just like I did with New York, I have negotiated (by force) for the General Counsel of Rhode Island DMV to send me a written document, signed and on official letterhead, stating that Rhode Island must recognise any moped registered legally in the owners home state, whether it bears a plate or not.
Email me for a copy email@example.com
I hit them with the fact that the USDOT inspects and tags mopeds that pass safety standards with an official VIN plate. Therefore the United States federal government declares mopeds motor vehicles, not recreational vehicles as some states claim. That being said, they then fall under the same Constitutional requirement under the interstate commerce clause as any other motor vehicle, and all states must recognise any others, no matter what the home state requires or issues.
I told her that if we do not get a document, we will ride anyway, and the first ticket issued will trigger a lawsuit by me in US Circuit Court, Boston District. Also, if she was legally notified in advance and failed to act, she would join the ticketing officer and the State as a named defendant. The document was forthcoming quickly thereafter.