Last year I encountered some of the worst stretches of corrugations I've ever seen on the Canning Stock route and the Gunbarrel Hwy.. some of them went for more than a hundred km stretches and while I watched nearly everything in the car fall to pieces (GPS, Radio, Car Video Recorder, Camera Lenses (yes that was plural) aftermarket diesel tanks cracked and numerous other things I can't remember right this minute) the actual car was fine.
Broken shock absorbers were hanging from the tree's at one point as a testament to how bad that particular stretch of track was but mine were fine (I have Bilsteins) as was the rest of the car. I did lower my tyre pressure and attempted several times to find the 'sweet spot' of speed which usually helps (no help this time though so I just knuckled down and drove getting it over with asap).. and still the car was fine. I think if your car is well maintained and you have it checked and serviced a couple of weeks before you leave home and you drive to the conditions you will be okay. I always make a point of having a peek under the bonnet daily when travelling over rougher terrain just to look for loose connections and hoses that may be rubbing etc.. it could just save you some heart ache later. I carry spare everything (including shock absorbers if the area is remote) for piece of mind too.
If I were you I would stop worrying, ensure that your car is in as good a condition it can be mechanically before you leave and get out there and have a great time!
Where are you off to btw? :)

