Tractor Model

Tractor Model refers to a type of Federal Truck That started being produced sometime in the early 1910's.

Details
The Tractor Model is similar but very different to the standard variant of a certain model. It has a much shorter wheelbase than normal models(example, standard Model TE s have a 144' wheelbase, while Tractor Model TEs only have 102' wheelbases). The Tractor Model also has a early fifth-wheel hitch much like modern semis.

The Tractor Models only had one bed as an option, the fifth wheel hitch, but did have options for different tractor trailers, but were most commonly used for carrying big logs from place to place. They had an entirely different rear end to accommodate for the extra weight, but these rear ends were often replaced with heavier ones anyway.

The 'Tractor Model' Federals can often be thought of as the first real semis, and are what every other semi afterwards likely evolved from, wether by looks or function, even to modern semis of today.

However, the Tractor Model Federals did a very specialized job, that not many people needed, so much less of then were manufactured than any standard model, leading them to become extremely rare to be seen surviving to today.