The Model TT was based on the Ford Model T. This factory-assembled truck had a longer wheelbase and a heavier frame than Model T. It was replaced by subsequent Ford Model A.A. and B.B.
When first produced in 1917, the Model TT was sold as a chassis with the buyer supplying a body. The price was $600.
Starting in 1924, the truck was available with a factory-produced body. By 1926 the price had dropped to $325. In 1925, a hand-operated windshield wiper was added.
The Model TT was very durable for the time, but slow when compared to other trucks. With standard gearing, a speed of not more than 15 mph was recommended. Source: https://en.wikipedia.org/wiki/Ford_Model_TT