Model 3200 Dunbar Popcorn Wagons produced on Ford Model T's with a
Smith Form-a-Truck Conversions

Orignal Dunbar Factory Drawing of Ford Smith Form-a-Truck Dunbar Popcorn Wagon Auto

An Original Dunbar Postcard Featuring a Popcorn Wagon mounted on a Ford Model T with a Smith Form-a-Truck Attachment

Dunbar's Description of their Dunbar Popcorn Wagons mounted on Ford Model T's converted with a Smith Form-a-Truck attachement.

Below is an original 1918 description, as mentioned in the above letter, written by Dunbar & Co explaining their production of Popcorn Wagons mounted on a Model T Ford converted with a Smith Form-a-Truck Attachment. This is why Dunbar Wagons mounted on vehicles are called Model 4 Autos in the Dunbar catalogs. They were originally built on an automobile, not a truck and the name Model "for" Auto stuck (Model 4 Auto).

1916 Smith Form-a-Truck Advertisement  in the Saturday Evening Post