In semis, this effectively gives you the battery swap ability. I also think you can do battery swaps by just doing a second trailer that is a "range extension trailer" (kind of like you see UPS trucks with two trailers, at least in the midwest you do).

The range extension trailer could also do hydrogen (I am NOT a propoent of hydrogen in general consumer/commercial applications, too much trojan horse from the oil companies and other fraud, but it probably has its uses, and might here as well).

It might also give a braking regeneration ability. Driving a hybrid / EV makes me think of the 100 years of auto driving where we have wasted all the braking energy of our cars to heat in brake pads and how much carbon that must represent in the atmosphere, it is insane.