bike bits - racks
Busting a rear rack on some isolated track out a long way from the nearest bike shop might turn out to be terminal for that leg of your journey.
A sturdy alloy, or stainless, rack is essential.
Tubus or Old Man Mountain racks are not easy to find in Australia even in the state capitals. Any suitable replacement will be difficult outside a good bike shop.
There aren’t many well stocked bike shops in Central Australia.
If you need to buy a new rear rack think of getting a double rail. It drops the load a little lower which aids stability, and allows for easier removal of any rack top bag.