As noted, you are legally required to meet the weight, height, LENGTH, weight and speed requirements of the states that you are traveling through. Some people claim they are never stopped, then you hear of a few that do get stopped, forced to unhook to get to a legal length and find another way to tow the trailer out of state and/or get a ticket.
If you are stopped for any reason or have an accident, it up to the investigating officer to decide if he is going to look at other issues on your RV rig.
I know that if someone like this hits me, I'll be asking questions about the legality of the rig and the operators license status.
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot