There’s a few ways to execute 4 wheel steering but generally for offroad driving it’s done with a hydraulic steering rack and some with electric and a remote control similar to operating an excavator. Turn a lever and the rear steering axel responds.
For on-road vehicles the rear steering is automatic it’s a computer controlling it. [https://www.thedrive.com/cars-101/41613/rear-steering](https://www.thedrive.com/cars-101/41613/rear-steering)
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