Hi all,
From my inquiries with Mike @ Couplemate (Brisbane)
You are going to need something like this on the draw bar OR something like the drawing I put up on the 'chains' thread
https://www.couplemate.com.au/trailer-parts-shop-caravan-parts-shop/safety-chain-holder/10mm-80g-safety-chain-holder/ Van
and then something like this on the tow vehicle
https://www.couplemate.com.au/trailer-parts-shop-caravan-parts-shop/safety-chain-holder/10mm-x-8000-kg-safety-chain/ vehicle
WOW what a can of worms this is......NOT a cheap exercise.....but to be safe.....its worth it