Hetzer, I have to say that I have no experience 4wdriving in Vic.
All I have done is in Tassie.
I have had a look in an old reference book (Yep - printed version) and the track described by Ron Moon as "Victoria's Outback" looks good.
300km of desert and outback country driving from Ouyen to Lock 7 on the Murray river.
Not sure if that was the type of driving you had in mind??
Probably 2 nights camping on the trail.
Normally my son comes with me, but he is at sea all of July (Marine Engineer).
August would be good, or back to my original suggestion of Feb 2010.
Anyway, very flexible so above is only a suggestion.
PK