I watched a true operator replacing sewer mains... the mains were put in 70 years ago before the area was built out... due to topography the mains run through the downslope backyards with only access from the creek straight up unless you had a crane or skyhook to drop one in.
It was like watching a YouTube video... the mini-ex clawed it's way up nearly 60 and 70 degree slopes... not even sure how the engine stayed lubricated at such extreme angles?
Through a combination of using the hoe, the rear blade and tracks there was no place he could not get... at times it looked like a monkey swinging through the trees.