Hi girls
Here is one site that has all the stop overs and phone numbers for the trip across. The prices are about what we had to pay.
Going over we stayed at Balladonia, Nullarbor then Port Augusta.
Coming home we stayed at Ceduna, Eucla and Coolgardie.
It would pay for you to print out a list of the numbers so you could ring the place you wish to stay in advance
Glenn and I have also stayed at Kimba, Border Village, Madura, Cocklebiddy and Norseman.
Just bare in mind that Yalata is no longer operating.
All these stops also have fuel

nullarbornet.com.au/towns/eucla.html

I hope that this site is a help.
Dianne