McQuerry full trailer - idea for a cargo/toy trailer..

Anyone remember those horse trailers that were set up as a wagon style - with the axles at each end? The front axle swiveled like a converter dolly under a heavy duty commercial trailer so they could be pulled by a car without transferring big tongue weight to the tow vehicle?

Often thought a trailer laid out like that with a low floor would be an handy unit 2 behind the truck and camper...