You may also want to look into the Hog Slammer designed by Southern Outdoor Technologies. The videos and testimonials are impressive. All you need is stock fencing materials, bait, and the trap and they are catching hogs in large numbers. I found them on huntingblindsunlimited.com
I set a trap out a few days ago that looks a lot like the one pictured on the previous page. Haven't caught anything yet, but I am hopeful. My wife saw two young pigs in the yard about a week ago... :(