a variety of advertising cars

mobile showroom. astonishing

 1899 Woods Electric truck, made by the Woods Motor Vehicle Company of Chicago, Illinois.  It was delivered to the B. Dreher's Sons Company of Cleveland, Ohio on December 31, 1899
Thanks Steve!

all from http://www.autopuzzles.com/

1958 DKW "Universal" Kombiwagen

What are the buttons under the radio? The numbered ones.

the paper in the window that describes the car descibe the car as having an optional Marine Band radio, is that what the numbered buttons are? Seems most likely