If you're gonna do a small trap i think you're going to educate 5 hogs for every one you catch and make them trap shy.

I THINK a better idea is get several hog panels (like cattle panels but they have smaller holes in bottom to keep little pigs from escaping) and find a shady spot in some trees and kind of brush in a larger trap. Put a root or swing style door and brush it on real well but don't set it to close until you've prebaited a couple weeks and given them time to get used to it and going in and out. Set up a game cam to get an idea how many are using it and how often. Set it and go back in a day and then every day. Law requires that I believe. Good luck.

From what I'm told a small trap just makes hog problems worse.