I've updated the Nationals Page on the Mozzy website with camping information - which I'll reproduce below.
National Titles 2013 - Information We can camp as a group at the Eagle Point Caravan Park, which is about 6 minutes drive from the sailing club, and on the shore of Lake King. This is a very popular family camping destination so it will start to book up soon.
This diagram below shows an area of the park that would suit a group of Mosquitoes. The sites available at the time of writing (May) are highlighted. At the top of the diagram is the lake, to the right is School Road, and to the left is the Fauna Reserve.
The sites prefixed UP are (not surprisingly) unpowered and the sites marked 1,2,3,E,D,B, & Z are powered sites. The unpowered sites are adjacent to School Road so trailers can be parked next to these sites (there is no fence on the boundary - only posts to stop vehicles - there are also no gates or pin-codes at this park).
Prices are around $24 for unpowered and $34 for powered sites.
Call the Eagle Point Caravan Park on 03 5156 1183 to make bookings.
They also have some cabins available.
There is also grass for camping (or parking a caravan), and plenty of extension leads, at my place (about 600m from the Caravan Park).