So how many have actually signed up?? Do you plan on the French Line or something else? Are folks taking spouses/partners?
Seems like a 3 day crossing is pretty much a dash with no time to "smell the roses"' -it is 504k from Dalhousie to Birdsville, 757 from Kulgera.
Brisbane to Birdsville is doable in two long days--Quilpie is about half way. We just did that run in reverse.
I just came back from a Simmo disaster --my "colleague" decided at Kulgera that as it rained in Alice Springs, he would detour via Oodnadatta and skip the Simmo--and he had the fridge, max trax etc. so we were left with little choice but to tag along--after driving 5,000k and months of planning---especially as 50% of the Oodnadatta was closed. Really unhappy and lesson learned--don't share critical stuff!!!