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They've been working on software platooning for over 50 years, and at this point are settling for having a carlength between every two pods in a platoon, and still haven't solved it reliably at scale. Hardware coupling just works, and it's cheap too. (Why use Flufferbot if you don't have to?)
I think you are onto something. With self propelled entities, there might be room for light mechanical coupling for control, while letting the loads still be carried by the normal suspension and drive train elements. This allows for regenerative braking distributed in the normal way while keeping connective loads from summing as the train gets longer.
Examples are:
1) the lead follow connection with (world champion) Swedish Lindy Hop follows. They move precisely with very light loads through connection points.
2) Mother puppy discipline. Here are some photos of a mom teaching a pup not to play "bite and run:"
Notice that the pup survived from this later image.
A dog walking on a slack leash is another example of light mechanical coupling of self propelled vehicles.
If you consider the recent Tesla Model 3 rear bumper cover disconnects... Tesla might be working on this.
I agree that double density on highways and at stops, with vehicles that can independently choose any pick up or drop off destination at the sparsely populated end will be very good for Tesla stockholders.
And agree with Tesla that all the control compliance can be built into the rear bumper cover if dual motor model 3s are used. Guessing that inductive motors have more instant torque, but have not really thought that through. Bumper cover compliance and torque response of the vehicle are related.
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