To further confirm the manufacturer of this crane, a photo from a wartime australian magazine clearly shows "Fowler 10 ton crane".
With this one, it seems that "Fowler" is the confirmed manufacturer of these cranes, and that they didn't were made just for the RAAF, but also had other civilian users. This one is with what looks to be a Ford G8T cab truck, 6x4 or 6x6? drivetrain! Never one f these before!
From:
"The Australian home beautiful : a journal for the home builder", Vol. 23 No. 10 (October 1944), page 16. (article: On the Job with the Housing Commission; photos and notes by W. A Sumerset)
Source:
https://nla.gov.au/nla.obj-294452887...e/n15/mode/1up