"recharging that to 80% full in 30 minutes is going to need a 1MW supply. Connecting that safely and dealing with the waste heat is a non-trivial engineering challenge in itself. Dealing with 10 or 20 electric trucks simultaneously …"
Exactly. What's the electric company going to charge to bring in 20MW of capability to an ET truck stop? That's about 167,000 square meters of solar panels (600W/sqm @ 20% efficiency) to be "green". I'm also disregarding other losses in the system or I'd be typing and doing sums all day. 600W/sqm is a very rough UK insolation yearly average in those years when there IS sunlight hitting the ground.