It appears to be the tracked trailer that was used with the Japanese Type 94 tankette to transport ammunition etc. Type 94s were used in the Japanese conquest and subsequent occupation of Java.
Googled Imaged " type94 tankette trailer" & they don't look like that. type 94 tankette trailer - Google Search
Look up Vickers & Carden Loyd Utility Tractors, Dave. Certainly some went out to the Dutch East Indies, and their chassis appear to have been extensively modified to all sorts of odd jobs. Running gear looks right but not dug into assorted patterns.