I tow an 8x14 enclosed motorcycle trailer behind my 36 foot 5th wheel and believe the 5ver tows nicer double than on its own. I can see the need to have laws around double towing such as being required to pass a driving test where you demonstrate that you are capable of backing up a double trailer set up and or being required to have your set up pass an inspection ensuring adequate braking but to totaly ban double towing in a state seems wrong to me.