I don't know. Maybe, he has a greenhouse, up there. That way, he doesen't have to stop for groceries so often?
Ok I found that this one was a Custom Dodge Chassis Built after the experimental one above CCI’s perfected version (if we can call it that) of the Dodge-based, custom-made rig was named the Skyscraper. Two cars rode on the truck chassis with another three on the tag-along trailer. Anouther view Some Ford Prototype Pictures And some more conventional rigs
The Ford prototype looks somewhat comical. But, I'd rather be in its cabin than in the Dodge's if the load were to get loose during heavy braking. I wonder what they thought would be the advantage of having shifted some of the load onto the tractor, instead of leaving the entirety on the trailer, as shown in the last image
I don't think driver Safety was a major concern in the design of either one, my best guess as to why they were designed that was the conditions and economics of the time. In the 1930's and well into the 1960's most dealerships were located in urban areas. So not a lot of space for large trucks to get around in, and very tight corners with no dedicated turn lanes. So the trucks had to be shorter with a tighter turning radius. Most trucks that met those demands could only carry 3 to 4 cars. These designs met the Urban driving needs, and could carry a 5th car. Also keep in mind that most trucks of the day had less than 100 HP available to tow with. So that also limited the size of the total rig, and how many cars they could carry.
There was also a length consideration for interstate and U.S. highway trucking, driven by the ICC, which is why a lot of COEs were built until the ICC was dissolved in the early Eighties.
Those super high cab trucks are pretty dangerous in my opinion. Someone could walk right in front of it at a Red Light or Stop Sign and the driver wouldn't even know it. Especially a young kid or a slow walking older person. Besides strange looking, I never liked them.