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The topic of the thread is why Tesla's are bad at towing, and the conclusion is that batteries suck and need to get better, much better.
I expanded the topic by mentioning it's not just energy capacity that matters, but how quickly it can be replenished. If it could be replenished very quickly, it matters less how big the "tank" is.
The point of a trailer isn't to be as aerodynamically efficient as possible, but to haul the intended cargo in a given footprint and weight rating. There's no "solution", only trade-offs.
The reason trailers don't have regen is because only 3% of vehicles are EV in the first place, and they already have regen built in. Redundantly adding it to a trailer adds weight, complexity and cost. It's not that it hasn't been thought of already, it's that people thought about it and then realized it was dumb.
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