One would hope most suspensions and bearings are up for places like the Birdsville Track, Strezlecki Track etc etc ...these are graded gravel highways these days compared to the actual tracks they used to be 25 years ago. Last visit to the Birdsville Track about 4 years ago I easily sat on 100kph towing my camper, the "track" was a 3 lane wide road smoother then most Qld bitumin highways. Conditions obviously change I know, but it's not like it used to be on those main tourist hot spots these days.