Long distance dolly towing

They used to make I don't remember the name, "towing hubs." These were integrated devices, you remove the rear wheels, bolt the unit to each side like it was a wheel, and put narrower "towing" wheels and tires on. They free-wheel within themselves, leaving the rear axle stationary.

I've always wondered, with tow dollies, whether you could use a REAR dolly as well like the wreckers do: