I would love to pull my boat behind a FW. I have specifically asked 3 DOT officers about this. All have said the same thing; it's illegal. I asked about commercial doubles since I already have a CDL. They said that if my truck, FW, and boat trailer were all registered as commercial vehicles
Yeah ...A CDL gains noting for towing non commercial doubles.
I went from a chauffeurs to a commercial chauffeurs then grand fathered to a CDL when they became available.
I dropped my CDL years ago simply because showing it to a LEO brought other questions about my non commercial/not for hire truck/trailer and my personnel equipment.