Putty Road WA

I am planning a trip from my home state of WA to the Hunter Valley just inland from Newcastle NSW. I would like to travel along the lengh of "Putty Road" that goes through "Wollemi National Park" from "Windsor" to "Singleton". But I have no idea of the road conditions in towing a medium size caravan on that route, has anyone done it who can advise me?


Mike, WA