I believe there is somewhere to get the information you are looking for Monday. I found such information for Victorian Hospitals in a government document called the "maternity services performance indicators". It lists the VBAC rates for all Victorian hospitals. I am sure that there would be a similar document in NSW.
It is a really valuable piece of information to have as your chances of having a successful VBAC are directly tied to hospital policy, and the hospital policy is clearly shown up in their statistics! I think you are right when you say that most hospitals will say that they support VBAC, but in reality there can be a huge discrepancy in the level and the quality of the support they offer.
I am currently
pg and looking into a VBAC also. From the little research I have done I am feeling more and more empowered about it and really excited! If you are able, you should look up one of the Bellybelly members 'GardeningKate' to read her VBA2C story. I really found it inspiring.
Also, look into hiring a private midwife or a doula to be with you at your birth. The statistics once again look very favourably on women who have extra professional support with them in birth. If you get in touch with some private midwives and ask some questions, they may be able to help you find the information on hospital VBAC rates too. I recommend looking at the Maternity Coalition website as a good place to start.
Good luck Monday!
ETA:
here is a link to gardeningkate's birth story