Earlier quoted context omitted.
It seems like there's an aerodynamic advantage to the platoons. Placing an autonomous truck in the lead of one of these platoons, down the road, seems like a reasonable "upgrade" strategy.
Right up until there's an accident and the lead truck suddenly has to slam on the brakes. Depending on the length of the 'platoon' and traffic density, that could get really messy really fast.
Unless the front truck is actually hitting something, causing it to slow down more than the following trucks (and then quickly turn into a pancake).