The issues I see with electric trucks for most long distance haulage in Australia is that most trucks already operate with the maximum legal axle loading. This means that the difference in mass between the batteries + drive train and the fuel + drive train comes straight off the revenue load. And the power required for a fast charge of a B-double is so much higher than for cars that a truck terminal or recharge station will be a much more significant load on the local network.
I also do not remember seeing anything about tesla's trucks set up as B-doubles. Or, for that matter, road trains.

