It's not easy to find private land to hunt hogs. They are very "nomadic" and go where the food is and the pressure is not. Flint Head is correct on what he posted on most of the land in SC because most of it is leased by hunting clubs and the general rule is to shoot every pig you see.
To have good Hog hunting you need to go to some place that keeps the food out and the pressure off.
Ray is doing things right and is why he has great success. You would be better off in the long run, to go to Rays a couple of times a year. That would be your best chance to kill a hog.
Maybe you will get lucky and your in-laws will have a connection with someone with pig property. If you find a place in the Columbia area to hunt pigs, I can hook you up on a place to stay as long as there is room for me to go hunting with you
As always this is JMHO
Benjy