You have the connections, call for us and see if you can get the straight scoop. I'm a retired cop myself and I spent an hour this afternoon looking through the vehicle code and I can't find the specific section that would either prohibit or allow double towing. The only thing I know for sure is at one time there was a specific California law that said you could only double tow behind a pickup and the first trailer had to be a 5th wheel and the second had to be a boat trailer. I know that law is gone now. I don't see anything that says you can't double tow nor so I see anything that says if you do double tow that the first trailer has to be a 5th wheel. As far as I know the commercial drivers license requirement with the doubles endorsement has been required a long time, which is what keeps most people form double towing. Of the people I am familiar with who used to double tow, they were already truck drivers and already had the proper license for semi-trucks, so they just also double towed with their private trucks too.