NH State RV Law?

Got the Camper's Inn flyer in the mail today. On the back it states the following:

Have you heard. New Hampshire - has a new state law. All RV must have state inspection by June 30th.

Does this include seasonal campers? What if you don't have a tow vechile for your seasonal camper, will you be exempt? What about Mass campers who probably make up 50% of the population (if not more) at NH campgrounds.

Anyone have any more information? Why did they implement this law?