I know Tesla claims "<2 kWh/mile" (That, with the range and the Model 3's battery specs calculates to about a 6 ton battery) (that would be " 1.25 kWh / km" when converted to units used in the vast majority of places)
The industrial loads does not often vary as quickly as the world's truck fleets being connected and disconnected though?
(I do see uses for battery-electric trucks for local deliveries though, long distance just seems better suited for hydrogen (or possibly electrified roads) though. (but the report below seems like it might not be completely impractical, with assumptions about future gains and different weight limits for electric trucks)
This report seems interesting as well. They claim around a 4 ton battery by 2030 and energy consumption between 1.1 kWh / km (2030) and 1.4 kWh/km (now) for battery-electric trucks (which seems similar to the Tesla claims) (It would be interesting to see if battery energy density can make those gains) (They work on a battery with the capacity to do the maximum legal driving time in the EU for a day, with overnight charging, which might be more practical than fast charging)