Engesa Boomerang walking beam suspension - video

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Mack has been using walking beams for a century!
From the video I can’t see exactly how the power is transmitted to each one of the rear wheels. If I had to guess I would say there’s a chain inside the walking beam transmitting power to each of the rear wheels and the chain is being powered from the center pivot point. Of course this is just MHO?
I think the driver has to re-read the book and understand what constitutes a running start.

Gear reduction boxes are mounted on the rear axle. The wheels are then mounted to the reduction box hubs. No chains were harmed. I believe Portal made those.