Hi Fred, I have 'Caravan Parks Australia Wide' and find it invaluable. I also have 'Camps6 Australia Wide' by the same people and it also is good value. Both available at News Agent's or your equivilant to RACV. Camps6 is about to be overtaken by Camps7 in Mid February. Another one that is good and just come out is 'On th Road' Guide To Free Campsites put out by 'On The Road' magazine. I know you aked about CV Parks but thought I would mention the others as well.
Good Luck, and,
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Live Life On Your Terms
DOUGChief One Feather (Losing feathers with age)
TUG.......2014 Holden LT Colorado Twin Cab Ute with Canopy
DEN....... 2014 "Chief" Arrow CV (with some changes)
The Caravan Park book recommended by Dougwe and rockylizard is well worth the money if regularly using caravan parks. There are freebies also available but they only list the parks that pay for an entry.
"Badgers", also mentioned above, is an excellent site to get an independent review.
If you have access to the internet theres always www.yellowpages.com.au which will give you every caravan park in an area and links to their webpages etc. Unfortunatley you will have to dig deeper for reviews..