We went down to Dubbo last September. For us, Warwick, Goondiwindi then south to Mooree was the most obvious route.
The road from Warwick to Goondiwindi was a bit rough due to flooding but wasn't too bad.
We made an overnight stop at Mooree on the way down but did the trip back from Dubbo in one hit with 3 kids. It was a long drive, but we were keen to get home.