Hi Scott,
I never saw any army Utes/ station wagons with a tow bar back in the XB , XF , era. Same, same with the Commodore, Valiants, Nissan Bluebirds. I reckon if you hooked a trailer up to a Bluebird you wouldn't be going anywhere.
The XY would look smart with a matching trailer - pity 😩
Cheers Mate,
Mick