Keith,
In 2011 we came back from the West via the GCR and Oodnadatta.
The worst road conditions we encountered were:
WA border to Kata Tjuta (sandy and badly corrugated)
Oodnadatta Track, from just north of Oodnadatta to the Marla turn-off (not far, but
very badly cut up)
They could well be OK now.
As usual, drive to the conditions......