VH-EXY Aero Commander 680E 
It was, in fact, used to support Donald Campbell's world land speed record attempt on the dry bed of Lake Eyre. DCA had denied permission for DC-3s to land on the lake bed and set a weight limit of 10,000 lbs for such an operation, a limit easily met by the Commander, topping out, as it did at around 6,500 lbs. In the event VH-EXV only operated a few flights between Adelaide and the Lake Eyre site.