Dick, I'm not sure of where SSR radars are located. I do know there was en-route radar at Round Mountain (between Coffs & Armidale).
I have operated into Ballina for about 21 years and was never passed more than about 4 aircraft as traffic. That's easy enough to sort out if one is conservative.
I worry more about hitting the hang gliders off Rocky Point and Skennars Head from RWY06
The 60's designed plane I fly these days has ADSB, therefore the SSR point is moot
