Yes, thank you. That is where I found my information about "restricted use" plates. Farm plates "restrict" what you are allowed to haul with a semi-tractor. I also looked at
International Registration Plan, Inc. , which I am guessing is over all states and it states: "A Recreational Vehicle, a Vehicle displaying Restricted Plates, a bus used in the transportation of chartered parties or a government-owned Vehicle, is not an Apportionable Vehicle; except that a Truck or Truck Tractor, or the Power Unit in a Combination of Vehicles having a gross Vehicle weight of 26,000 pounds (11,793.401 kilograms), or less, and a bus used in the transportation of chartered parties, nevertheless may be registered under the Plan at the option of the Registrant."
So what I read is that it is at the option of the registrant with restricted plates to file for apportioned plates.