Articulated Vehicle Steer Question

[JDH429]

Have been working on a design for an earth scrapper like a cat 657G and was wondering about the steering and if its possible to get away from using hyd cylinders on the pivot and using gear motors on all four corners instead and mixing the front two channels to work independently to steer the front end like a wheel chair works... The pivoting rear half should follow, No? Any one tried this? Sounds like it could work...