Back around 1974 I was involved in the recovery of a No9 FGT from Wiseman's Ferry to Melbourne... we drove up in a Mini panelvan and I drove the FGT all the way back. It was unrestored, had almost no brakes and no elecrics other than the ignition circuit and had a permit to drive to the border which had expired the week before.
I was doing it for the owner and it's not the sort of thing I'd comtemplate doing these days.
Suffice to say we made it and that was some sort of miracle as the clutch started to fill with oil and some of the steeper hills on the way back had to be done in first gear because of slippage.
The trip must have been around 2500ks - an overnight drive up and 5 days drive back.