That excavator dolly was pretty cool. I didn't know those existed. Seems like a very fast method of moving these things around short distances.  why do operators stop when loading onto a dove tail, they should always move to a position where they won't bust the beads on the tires of the trailers first. Most of these are only dangerous to the machines.  The one in the river what a piece of crap I drove a D6 in the 70s would have never bogged down it would have climbed that bank no problem that thing was gutless.