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On the Cybertruck forum, there has been lots of talk about a battery pack on a trailer, even motor for regen and drive capability...
I am not a fan of the trailer providing motive power, but I am a fan of regen, especially down hill.
I think for the ultimate aerodynamics some kind of physical aerodynamic 'bridge' between the tractor and the trailer makes sense... but I think low hanging fruit would just be making the trailer fit as much as possible into the wake of the tractor.
If the trailer was narrower and as close to the height as possible than the tractor that would be something more easily achieved without recreating a lorica segmentata for towing.
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