The hanging car was just an accident. I've seen it in a "parking" series.
The dude servicing his aircon is nuts- the mount would have been designed for the a/c's weight, not it plus him.
Imagine sleeping in one of those tents and feeling a tiny "slip" in the night as a knot tightened or something.
I guess the guy on the top of the RSJ was lowered there by crane.
And as for walking along that cliff face plank, and crossing the gap...