Re #6, I've had loads get unstable with that type of rack when it was on the back.

Just the thought of shaking it with every steering correction , is unsettling.
[they set it up in the shot, to sell them , apparently, ... ]

back in the day, when people packed them up .. on the rear,
same company's cast aluminum racks,

some folks tried to triangulate them a bit.. guy wires, to overcome, this.

steel cable and a couple turnbuckles to get the cable tight

may be a cheap kludge to make it work.

theres little tubes made, to make the loops in the end,
then hammer shut to keep the loop fixed.

Good hardware store will have stuff..