Originally Posted by
fietsbob
Think about the Dolly under the front of a set of doubles ,
Rear trailer, on a Heavy Goods Vehicles, aka Truck or Lorry.
that is a Model ..
Or something known as a dog trailer in which the wheel setup is similar to a wagon, the front wheels turn, as well as the connection between the truck and the trailer tongue. Those trailers turn sharper than a wagon too, heavier, and capable of moving faster because of the tow vehicle, but they are road legal anyway.
The biggest issue I see with a bicycle towing a wagon is a proper hitch system.