I respect the stacking, and the bravado. No one does cool stuff like this anymore. Joe just told me why, it's because this was at the 1964 Worlds Fair! No one does those anymore either!
4 years ago I ran across the GMC tower of power for the 1st time, and then found some of the other stacked manufactures photos, and posted them. You might have seen it, GMC was put to shame by TUI, a New Zealand company that doesn't take challenges lightly https://justacarguy.blogspot.com/2014/03/yesterday-i-psoted-stack-of-gmc-trucks.html