I was looking at some old Cat brochures and pictures on the net and saw an interesting picture of a Cat wheel loader with the front wheels converted to crawler tracks. Not steel cleats on the tires but kind of a triangle set up like a case/IH quad trac ag tractor except it used steel tracks off a dozer.
It's in one of my cat books. They also made one with tracks on all four corners. Prototypes that never went anywhere IIRC.
It was called dicetread, steel track on a driver. It didn't last long. Later Bob