The CSR is probably the most grueling road in Australia, it made the Gibb look like a 4 lane highway. The corrugations really have to be seen to be believed, some sections you can barely do 10kph, with out running of the road. On one particular day we drove 9 hours and only covered 120k's. You could possibly get an offroad van into Rudall River, but not the CSR, the first dune would stop you dead. Some of the dunes had what could only be classed as a runway for a run up, peolpe towing offroad campers had backed into the scrub to try and build up enough momenteun to get over the top, I'm guessing by the length of them they must have being doing 80+ks when they hit the dune. But if they don't make they spin their wheels digging great big ruts and holes up the face of the dune making it so much harder for the next person. There is probably 200 or so really steep, if you keep hitting them at 80k's something going to brake sooner than later.
I found the best speed was about 15-30ks with the right gear selection, I managed to get over nearlly all the dunes fisrt attempt, but even still I compeltly shagged out the rear suspension.
Just remeber you have more than 1000 dunes to climb, gibbers, sharp rocks , corrugations, and possibly mud to negotiate, and takes around 14 days to complete, it's not for the faint hearted