while you're in the early days of planning, can i advise that:
-newell highway (from Dubbo going north up to Goondiwindi) is OK-ish but a bit bumpy
-anything heading north or eastward of Goondiwindi is as bumpy as hell and i'm never travelling on them again.
Given that you're being tourists, i'd suggest going from Dubbo to Tamworth and heading up the New England highway as it's 100% improvement on the Newell and Goondiwindi roads.
If you have an idea of how you want to cross Qld, i can post more info on roads
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