You are correct, I have operated dozers on high wall ledges and it has a pucker factor like no other.
You reminded me of a similar near-catastrophe. Guy with the gold mining claim downstream from us had an ancient small bulldozer.
A pine tree had fallen across the narrow cliffside fire trail. Now getting in/out from there to pavement went from what had been an hour, to 3 hours going the long way around.
Guy drove his dozer to where the tree was across the lane. The tree was resting at near 45 degrees from flat with the base up on the left bank, and the right side, top end of the tall tree, hanging off the cliff on the right side.
Guy asked me to come along as a spotter, he knew this was going to be dangerous. He bladed a ramp up to the near side of the sloping tree but there was no way to compact what he pushed to the far side. Then he started to drive the dozer across it.
But with the far side too soft, he teeter-tottered on the sloping tree trunk and slid down toward the cliff edge. He gunned it and just barely made it across, scarily close to sliding off the cliff and tumbling down to the stream far below.
I wish I could get that image out of my head.