The blocks they used were chosen for their shape and weight and for the effect on the Ford bed.
If somebody loaded like that on my truck there would be a big problem. It wouldn't matter what the truck was made of.
I have an old Chevy if you are wondering.
Was at our local building supply today, and checked to see if they had any round-edged building blocks- they were fresh out. Guess the Ford aluminum guys must have bought them all up.
They did, however, have a good supply of square-edged cinder blocks in stock........