This may seem a bit "off the wall", but what about having a handicapped number plate made for your cart - similar to the handicapped number plates affixed to vehicles (although this may not be legal). It could be fixed to the area where people put their old State number plates? There is a vendor who actually makes and sells number plates in the squares on vendor nights. I would think with a little ingenuity one could be made up for you and keep the real thing on your person.
You could start a new trend!
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A people free to choose will always choose peace. 
Law of Logical Argument: Anything is possible if you don't know what you are talking about!
Since light travels faster than sound, some people appear bright until you hear them speak
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