Hey nice Sandy Dave! Those "long wheelbase Commodore Utes" you mentioned were actually "stretched" standard utes that were used for Ambulances in NSW, the place that did the conversions was not far from where I used to live in Coburg.
The "6 wheel" one tonners (or "Two Tonners" after the conversion) were used for tow trucks in Sydney in the late 1970's and early 1980's. Most had 350's but some even had 454's, and were much easier to manoeuvre around the tight streets in Sydney's CBD, underground carparks etc.
I don't get it though, Tim's "Zom" has a brain, but no power steering?