Having had some success in these forums as a prognosticator thought I'd slide out a bit further on the limb. I believe the Tesla Semi will have multiple passenger vehicle battery packs - probably model 3 packs and certainly a minimum of four of them. Eight seems more likely. But they will be in pairs - because ... Charging will use multiple supercharges. Diesel trucks fill from both sides, Tesla semis will likely have 2 or even 4 connectors. The driver would plug in as many as he wanted to pay for (not sure they'll charge a fee for multiple connections but they might). If a truck pulled in and used 4 superchargers configured identically to what we have today he could see 480 kW charging. It is maybe more likely that Tesla will add semi specific charging spots Tesla would, then, have to make a BMS that can manage multiple charge inputs (likely isolating them one from another) and routing the current where it needs to go. "Pack balancing" would extend to equalizing of different packs. This is no small task but I think this would be overall a much simpler approach to the problem, just as using "a bunch of Model 3 motors" is the best way to achieve the power needed. Okay, neck extended - anyone have a guillotine?