1907 Catalog
Description of how the Dunbar Popcorn Wagon, Model 1250, can be modified for an automobile getting 12 to 15 miles per gallon and cheaper than keeping a horse.

1907 Dunbar Catalog Description of the Dunbar Popcorn Wagon Model 1250 mounted on an automobile.

1911 Catalog  
The catalog states, "We can furnish Automobile Running Gear for any of our Horse Wagons." This 1911 catalog contained 4 different horse wagons.