I hear you on this one. I too have a 9200 GVW truck and a 13,900 GVW tilt bed trailer. I have heard people state that when you go over 10,000 GVW on a trailer you need a CDL license. Of course no one has ever been able to show me the documentation. I even called the state police and could not get a straight answer. My license states on the class: CM -Single/Comb less than 26,001.
The dealer where I bought the trailer was not even sure. He did state that I would be in more hot water and the fine would be potentially larger if I derated the trailer to 9,990 GVW and got caught over weight.
So if the answer is that hard to find that even the state police could not give me a straight up answer, I figure my odds would be pretty good at a DJ if I ever got a fine for this setup. It seems it would be pretty hard for a DJ to find me guilty when right on my license it states Single/Comb less than 26,001.