I tried one Towbar/trailer place near Newcastle and he said he would build me a custom one for $700 cash and said that he didn't want any record that he had built it due to it not complying with ADR. I also tried ISP at Newcaste which has a huge range of towbars and they just weren't interested either as they also couldn't supply an ADR compliant towbar.

Now that I have moved to Adelaide I might try the local Towbar place with the Jackroo SWB option.

Otherwise I will buy the Curt hitch on Ebay and fit it myself, will still be cheaper than the $700 custom option

Thanks for the advice