It's a queue. A dequeue I guess, they can do it on both ends.

You've gotta tow 100 miles worth of vehicles with dead batteries vs. someone comes along the queue with a gas can and it's all good, you don't see any difference there?

The Rivian can be charged by towing it, at least that was the case in their prototype car shown off in Long Way Up (Ewan McGregor and Charley Boorman's Apple TV show where they (and their support crew) took 2 electric motorbikes up South and Central America)

This seems like a good idea. There are not enough EV's on the road yet to justify the cost of such a charging truck, so perhaps it needs to be subsidized by the government, similar to chargers, in order to be able to deal with powerless EV's stuck on a highway. I'd also like to see compact gasoline generators or spare battery packs that could be used to get 10-15 miles of range and stored in a trunk or on a rear deck.