I have the same problem.....
They won't go into the trap... (they are smarter than me, I bought the trap).......
I have actually found (with my traps) that hogs don't like going into traps when there are the hog panels on the floor. Don't know if they don't like stepping on it or what. But if you cover the floor panel with dirt, or completely remove it, you may have better luck.
but for that size of a hog problem, you may want to try a figure 6 corral trap to expedite the process.