Bill, Robert, Nuyt, thanks for the pictures and comments - I agree with all observations.
Here's another picture of a convoy of trucks on their way to Kediri, Java, dated 30 December 1948. I think they are Ford/Marmon-Herrington 3-ton 4x4 trucks, at least they have those distinctive 18" wheels - would those help in identifying if these trucks are of pre- or post-war manufacture? (
picture source)