It would be in Australia - the one I saw was at LWC at the centre on Darling Harbour.At ADI or at Timoney?
Mild steel mules are built to also reduce shipping and transport costs.
When I was at JRA we also built a sixer Taipan S400 for the Kuwaitis. The vehicle was made out of mild steel so as to get around some export headache caveats as well as reduce the overall GVM for reduced transport costs.