This is probably so obvious to those of you who have done it but how do you put up one of those door hangers for your horse trailer. The stiff cloth ones that you can put your fly spray, brushes in etc. Got the door thing at the feed store but there are no directions. I have looked at other people's but being very mechanically challenged I still cannot figure out exactly what to do. I need some kind of drill and bolts I think. The ones I have seen came factory installed so there is no hole in the outside of the trailer door. I am concerned if a hole is drilled in the door it will rust there? What kind of drill and bit would you use to drilll through metal anyway?