re: Tesla Semi could be ‘the biggest catalyst in trucking in decades’

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Thats the problem. These are gonna have to be charged about every 300 miles or so.

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I would think that is very optimistic to assume a 300 mil range on a semi pulling a load unless it has 250k worth of batteries tucked in there. I don't know how heavy the batteries are but weight becomes an issue also, I think they rough estimate the drivetrain on a semi to weigh around 5k or so. If they batteries start getting into that number or higher with the electric motors (which isn't far fetched), it could be a downside to owning one.

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A truck stop with 50 truck supercharging stations would allegedly eat as much electricity as a city of a few thousand people

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Yep and think about how long they will have to stay there charging to get back on the road. According to Tesla's site, it takes almost 6 hours to charge for a 300 mile range using a 90 amp/240V charger. that will chew through some power.

All in all, this is a step in the right direction but still doesn't address the stress that the large trucks (that we have to have, just a fact) have on the roads themselves.