Except for country dirt roads I don't think Australian roads are any worse than some of the roads around the UK.
No problem...
easy! 
That looks pretty good to me.
On that kind of road the trick is to go fast enough to float over the corrugations. Most people who are not accustomed to driving on dirt roads go too slow. About 120 clicks on that one should be fine
The three of us drove for about 100 kms on such roads. No other traffic. Was simply best experience in a car I've ever had. Nothng stupid. Just great fun. I took one 90 degree bend around a field boundary a bit too fast and felt the rear slide but nothing major and just smiles from ear to ear.
Took a long time to remove dust and small stones but what fun.
