Don't know about ALL but there was a TON on the Horry TRS - SCHP was actually using the system through a Florence Dispatch (that's what they "called it" anyway) which I thought was interesting , they used the Aynor TGIDs, (which is rare too), a LOT of it was on I-Call , in fact I heard more I-Call being used for the ticketing and so called security than I did the usual agencies.
The Florence Dispatch is generally used by Troop 5C (Georgetown/Williamsburg). I was picking up radio traffic on TGID's for Myrtle Beach Waterfront, Beach Patrol & Talk Around in addition to the dispatch group.
Horry County PD was out of control busy. Atlantic Beach Dispatch was a little active, too.
Florence dispatch is used by all in region 5; Florence, Marion, Marlboro, Dillion, Darlington, Horry, Georgetown, and Williamsburg counties. Most likely the county and hp units used that tg on the Horry system and had Florence disp on the same channel.