Not sure about using a duel wheel tow vechicle, I tend to agree with the idea of more rubber on the road, and better management of the tongue weight can only be good things.
One consideration I am thinking about is that these trailers typically carry most of their weight low in the trailer (a car strapped to the floor). By building racks and having a second row of boats higher up, not sure if we were exceding the designed weight distribution with the momentum of the sway???? There were lots of benefits of having an enclosed trailer that could carry 5 boats, but recent events have me questioning the benefits vs risk and challenges of transporting boats this way. This could just be the frustration of dealing with insurance companies/ not making it to NA's next week coming out though.