I have a feeder that is just for hogs too. They love the puddle under it, my wife calls it the piggy puddle because she has shot many pigs why they were rooting around in it (then I get to drag them out). I have got pictures of them sleeping, rolling, eating and breeding in it. I will only move the feeder a bit when it becomes unstable. I wouldn't change a thing, pigs love a puddle. It is an attractant itself.
I do like cattle panel idea for feeders that we hunt deer at.
"Man is still a hunter, still a simple searcher after meat..." Robert C. Ruark