A cargo bike with powered trailer

Wash Cycle is a commercial laundry that services Hospitals, Hotels, and University campuses in Washington, DC, Philadelphia, and Boston, I've seen their bike riders towing 3-4 trailers in a cargo train. But laundry is lightweight, whereas this solution seems to be for heavier cargo. I wonder if two eCarla Cargo trailers can be hooked up like this, they also offer unpowered trailers so you could hook an unpowered trailer to a powered one. Presumably the controller on the bike would synchronize the motors akin to the one ring in the Lord of the Rings, "one controller to rule them all"? I understand the eCarla trailer uses an automatic run-on brake that uses Accelerometers independent of the bike controls.
 
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There are ebike cargo trains in NYC, pictured below may not be powered trailers but I know I've seen them around.
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