(EDIT: I just realized that parent already touched on some of this.) On the flip side, trailers spend more time parked at warehouses where they can charge leis

(EDIT: I just realized that parent already touched on some of this.) On the flip side, trailers spend more time parked at warehouses where they can charge leisurely. Eliminating the need for fast charging could extend battery life or even allow for the use of cheaper battery technologies. Maybe we'll even see a future where the tractor draws most of its power from the trailer. Then there's the other things you could do with a trailer that has always-on power. Climate control and realtime GPS tracking (and other telemetry) come to mind.