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I think we should do is have a second trailer that basically functions as the primary battery pack. The tractor's pack is back up or range extension

So when a semi pulls into a truck stop, you swap that caboose cab with a fully charged one.

so you have massive batteries just sitting on chargers waiting for the next truck to come by? seems expensive

How's that different than a battery swap that every other person suggests but doesn't seem to really mechanically make sense.