Funny side note: My Title is for a Dodge B-350 Van
If I wanted RV plates I would have to provide proof this is indeed an RV.
Here's what Illinois say's an RV must have.
A motor home, mini-motor home, or van camper displaying Recreational Vehicle (RV) license plates must contain at least four of the following six equipment items:
1) a cooking facility with an on-board fuel source;
2) a gas or electric refrigerator;
3) a toilet with exterior evacuation;
4) a heating or air conditioning system with an on-board power or fuel source separate from the vehicle engine;
5) a drinkable water supply system that includes at least a sink, a faucet, and a water tank with a an exterior service supply connection;
6) a 110-15 volt electric power supply.
If a van does not meet the RV equipment requirements, the applicant should purchase either passenger or B-truck license plates, depending on the design and use of the vehicle (625 ILCS 5/1-145.01)."
I had no Idea, Illinois can be a real pain.