After having hunted hogs in most all Southern states at one point and time, I have come to find out that they are nearly impossible to eradicate in an area. We have shot them over everything from fields to punkin patches, sweet potato farms, orchards, you name it. We have put a sizable dent in their population, but never eradicated.
They left for awhile, but were back later on. Maybe another sounder with stranglers from other maylays, but they did come back. Best this is to try different styles of traps and baits, keep them guessing.
I saw awhile back that was a maze style where they follow in a chute that loops around to the center where all the corn is. A 1 way door in the beginning, and then into a large center to the bait. They don't seem to know how to follow back out.
The other was a large pen with a remote control door. It was fed to the handlers cell phone. Pretty slick!!!