Yes, the KC is a truck series. What you call "Pickups" in the states, we commonly call "Utes" (short for Utilities).
To further complicate things in the early days completed vehicles imported into Australia were heavily taxed. Most vehicles came into Australia as running chassis with front sheet metal only. The body from the windscreen back were then made by local coach builders to either the original manufacturers specification or in my case to a style that the coach builder specialised in.
The vehicle I have was built by a company called Hope Body Works who amongst other designs also built what we call "roadster utes" with the rear tub section being made of wood or steel . The Roadster ute has a folding roof similar to a convertable.
In my case the windscreen and body is very "Vintage Car" in construction with the body and door frames made of wood with outer skins of metal and also a wooden rear tub. The vehicles were typically used by farmers.