3D Printed Truck. - Supplied Unpainted.
Large Concrete Mixer truck as seen everywhere, often in bright colours.
A good lineside industry, as big or small as suits you.
Based on a modern Mack truck, 
I will have others to suit 1950s thru in the near future.
Discount for multiple purchases can be arranged.
eg. 3 x Concrete trucks = $36-
        5 x Concrete trucks = $50-
So no reason not to have a realistic batching plant and yard full of trucks.