The depot hack predates the Model T.
Not mentioning U.S. Body & Forging is ridiculous; that was, after all, the company that first applied the name "Suburban" to a motor vehicle.
Station wagons in those days weren't just, or even predominately, applied to car chassis. Plenty went on light truck chassis. What is called an SUV today was a station wagon through the 70s, it just happened to also be a truck.
Dodge used a Budd all steel body in 1923. The Chrysler Airflow was all steel in 1934. Both predate GM's Turret Tops of '36.
The Town & Country was not more luxurious than the Crown Imperial limousine. They also weren't wagons in '46-'48, though they were woodys.
Ford had fake wood a year before Buick, in '52. Plymouth and Dodge had all steel wagons in '49.
There was no Buick Roadmaster Estate until the 90s, and no Plymouth Reliant was as big as a boat.
Not all third seats faced the back. Ford resisted rear facing third seats for decades, going from front facing to dual seats that faced each other. Both types were problematic for seating adults. GM reverted to front facing third seats, too, when they did the silly vanishing tailgate--those had no legroom at all.
But I forgive them, because they said the unspeakable--CAFE drove Americans out of safe, aerodynamic cars and into tall, topheavy light trucks--accomplishing exactly the opposite of what those regulations were purported to be there to do. And yes, I said aerodynamic. Say what you will about coefficients of drag, and modern bar of soap styling. Frontal area makes a bigger difference in wind resistance, and minivans are typically a full foot taller than automobiles.