Trenchless V-plow pipe layer

Trenchless V-plow drainage pipe layer from Van Damme Drainage.

https://www.youtube.com/watch?v=_5hfE8ReeiI

It makes me tired to recall the miles and miles of trench I have opened with various types of machines. I remember very few that did not encounter a large rock that required removal before the trenching could continue. I wonder how that V plow would handle a big rock?