Swappable battery packs seem like a good idea. It might even be faster than waiting to pump 100 gallons of fuel.

I'm thinking existing truck stops would have a better chance of working than the weigh stations. let's leave the government it, they are barely competent at weighing a truck. Some trucks might not see a weigh station for a week. Some stations are nothing more than a pull out on the side of the road.

Ah good point, I like that idea, especially as it utilizes that infrastructure and doesn't make them disappear when there's a transition to electric.

Does the Tesla semi have hot-swappable battery packs?

Not as far as I know, but a standard may emerge, as there is not way that an interstate system can operate if they all had hot swaps for each maker of trucks. I am sure they makers will develop a standard if swapping wins this game.