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For some local fleet jobs you can probably put batteries in the trailers (if the cargo is consistently not super heavy).

That requires special trailers and tractors rather than just electrical tractors able to handle any standard trailer.

It also requires much heavier and "non-standard" coupling between tractor and trailer since the trailer now needs to power the tractor rather than the reverse (and needs send significantly more power over the link)

I'm no truck expert but that shouldn't be that big of a problem. There are already power cables between trucks and trailers [1]. Thing is to just make a thicker one.

Weight is also no problem as 500kg of batteries is nothing compared to 20 tones of a trailer.

1. https://en.wikipedia.org/wiki/ISO_standards_for_trailer_conn...

> There are already power cables between trucks and trailers [1].

There are power cables but they're used to power the trailer from the tractor rather than the other way around, they're mostly controlling trailer devices (lamps, brakes, etc…) and the general power ones are small potatoes to power cooling (refrigerated trailers) or lifts, not full-blown truck engines.

> Thing is to just make a thicker one.

Well yeah as I noted with that "solution" you need much heavier coupling than the standard ones (and reversed power), so you get to throw all existing tractors and trailers in the trash, rather than just replacing the tractors and keeping all existing trailers.

And? Note that I didn't propose it as the likely universal future, just as a potential way to do battery swaps.

> And?

And that means much larger upfront costs for debatable benefits.

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