I for one would love for them to try to get around the weight limit for roads. An electric lorry would weigh so much that you would have basically no cargo capacity in the trailer without exceeding the limits and incurring massive fines.

It's the same problem with every electric vehicle: it's not the motors, it's the batteries. The motors weigh nothing in comparison to the batteries, and until we find a way to make them as energy dense as gasoline, or at the very least make them weigh half as much as they do, they'll never be as useful as a diesel.