Interestingly, my family owned an excavation company. We had multiple D9s that were taken to jobs and did the majority of the work.
But when some serious dirt needed pushed, we hauled the 2 Fiat Allis 41B to the job site. They weighed in the 60 ton range, with blade and ripper, and had near 600HP from a V12. The blade and ripper went one truck, the tractor on another, the tracks and cab on another.