Outback Border Park Cockburn - SA

Just in SA. Cross the rail line in NSW and head West a couple of hundred metres.
Adminstered by the Cockburn Hotel.
Because of proximity to line, and the highway, it is not the quietest park in existence, but relatively clean, simple with adequate amenities, a BBQ and walking distance to the pub (if that's important) where a reasonably good meal can be had.
16 powered sites, 20 unpowered, 8 on-site vans