I recently drove over to melbourne from Perth and purchaced my new boat, 7000 kms in 10 days with 2.5 days rest in melbourne before returning to Perth. I have driven from brissy home to Perth a few years back, Probably head S/W from bris to dubbo then broken hill, ceduna noresman then Perth. Or give Kwickshots Plus a call on 0427 908 174 he specialises in boat delivery Australia wide but is based in Gidgegannup WA. He might have a good price for you....
Cheers