Dave;
Several years ago, there was a mid teens International truck that was exhibited at the Urbana, Ohio show. Engine looked like the one pictured. Radiator was behind the engine as you describe. Used hard rubber tires and chain drive to the rear wheels. Haven't seen the truck for several years, so don't know if it is still around.
A family from Plain City, Ohio, used to exhibit a 1915 Clydesdale truck made in Clyde, Ohio. Was also on hard rubber and used a Continental 4 cylinder engine with a block cast with individual cylinders. Used a 5 speed and a 4 speed transmission. Truck was found in an abandoned stone quarry where it had worked. The family showed it for several years till the son died and they haven't showed it since. Was a treat to parade around in the truck with the son.
Gene