I fly with TCAS in the works machine.
I fly in class G for the majority of my working day.
This has been the same for the previous 8 years. Including under RAS etc.
I have never had a TCAS RA near an airport. I have had them on the NEW-ABZ direct route against Mil doing a 6000ft/min climb but never with a GA.
But then again in VMC in class G I fly visually in IMC I fly on instruments. Its this instrument flying in visual conditions which causes half the problems.
So I think there is a lot of miss information out there about what will and won't trigger a RA. You will get traffic traffic if it doesn't have mode C on. But an actual RA from a S&L GA showing Mode C 1500ft below not a chance in hell unless they suddenly lift the nose and get over 500ft climb rate.