Funny, nobody addressed what I thought was really odd about the article on this prototype. Supposedly this thing will "help" the tow vehicle to gain range.
Either the trailer would have to have a large battery and a means of providing power TO the tow vehicle, which currently the EV's are not set up to accept.
Or, it would have it's own drive motors to assist in propulsion.
If it provides propulsion via its own wheels, that will get interesting for how quickly it senses what is needed, and actually how the tow vehicle could end up reacting to the "push" from the trailer. And a flat tire on the trailer would do??????
Also, how heavy will this battery pack have to be? What starts out as a small light trailer will get heavy in a hurry.