It only takes a few boneheads to get state trails and or links to trails closed .
Speed limits around residential areas ignored off trail use ect.
The # on the plate is the same as your ORV # , the idea is trail ambassidors , ordinary trail users as well as Leo's will more easily find out who the offenders even if you can't physicaly catch them.
A hastily enacted law IMO and wouldn't be surprised that a state issued plate will be in the works with the appropiate ( and then some ) increase passed on to us.