Animalclub.
Just a long shot I guess, but Macair had a strange looking bus converted to an engine trest truck. I guess as a bus it would have held around 20 passengers? I wonder if Macair acquired that from TAA?
I think the engine test bus was acquired by Talair in the Macair take over and may have been shipped to Brisbane as I vaguely remember it at the Archerfield hangar.
I'd guess it may have been acquired by Max Paynter of Brisbane Aero Engineers at Archerfield??n I think Max is now gone but his son may remember.
That may jog some memories.