Chevrolet Pickup is a service class vehicle available in L.A. Noire. It is identifiable as a 1947 model.
This vehicle can sometimes be found driving around the residential areas between Hollywood and Wilshire. It can be difficult telling the various pickups apart, and it may be helpful to look for the specific paint job pictured.
Although it is identified as a 1947 model, it is a 1951 model because of the style of the door windows. It is also seen in the game as a tow truck variant. It is equipped with a wooden stake bed, and can sometimes be found with barrels in the bed, which seems to suggest that its a farm truck.