Where do you think they have been charging them...they may have to uncouple for an unforeseen charge. Google Tesla Semi spotted charging at supercharger.
tesla can charge anywhere they want. I was talking about carriers that purchase the trucks will be unable to charge at the current chargers.
There may not be any places close by to down jack a 40 to 50 foot trailer. Depending on what you are towing you may not be able just leave a trailer anywhere
I doubt that charging is going to be cheap for these trucks. In your scenario of needing to charge overnight with a daily usage of 300 miles which means if we assume 2kwh per mile that would mean you need to charge 600kwh overnight. So if we assume 12 hours of charging available that would mean 50kwh of charging per hour required. It will be interesting to see what the onboard charger on the semi-will be. However normally in order to get this much charging capability you would need a direct DC Charging system. Like for example a Tesla Urban Supercharger. However maybe Tesla will have a 50kw or higher on board charger for the Semi.