It has a Track & it Carries Stuff

[motto]

Is there any information on who built these pilot vehicles or how many were built?
I assumed that Ford had a hand in it so made the further assumption that testing was carried out in the Geelong area.
Lang Lang on the eastern side of Western Port Bay seems an odd choice of location for testing to be carried out unless the vehicles were produced in Dandenong which has long been a centre of industry.
Lang lang's only claim to fame is the presence of the nearby General Motors Holden proving ground but that was not established until 1957.
Regards the Japanese tracked vehicle my uncle reported seeing. There is a photo I think appeared in an AWM publication that may be of the type he saw. In the photo a captured example is pulling a string of Jeep trailers down a river bed.

David