If your dealing with hogs your choices are either to put a good fence around the feeder or hang it. Very little in this world is hog proof!
Sweeney makes a good feeder but I think they are over priced. Game country and the better moultrie feeders are good. If you get a chance to look in a Texas Trothy Hunter magazine they showcase most feeders. I personally stronly urge against On Time due to a serious drop in quality in the past couple of years