Electrically powered trailer wheels:
A design very popular with the Russians.
Years ago the very large trailers that moved the Russian ICBMs from the factory to the silos had electrically powered drive wheels.
These trailers were both pulled and pushed by 537 F/A’s that had generators built into the area behind the cab/engine.
Below; the rear “pusher” vehicle:
With both structural and electrical connections on the “probe”.
And on the trailer:
(All photos from the Strategic Missile Forces Museum in Ukraine
(Музей ракетних військ стратегічного призначення )