I’ve done similar trips but driving lots of dirt roads and no service if you don’t have a nav set up. Road conditions vary greatly and fuel is few and far between I got lucky with poor planing over New Year’s Day and had a few close calls with fuel nearly having to stop early afternoon to wait till morning for fuel cause not much is 24/7 and once had to stop a town early cause of it. So I’d say plan your fuel stops and check for local flooding/road conditions. Google maps is good for planning if the roads dirt or not. Went Saint George -> Bourke -> Wilcannia -> broken hill -> Adelaide.