We have done towel bars on both the doors and walls. One thing to watch out for is that some screws are too long and you don't want to go through the siding on the outside if you are on an outside wall. You can usually see how thick your wall is by looking inside a utility area where they have bored through to the outside for hose connections, video wires, etc. Since you have a sandwich, other than the 1/8 face panel and the fiber glass exterior panel, the inside of the wall is mostly a foam panel that has no screw strength so, if you can find at least one stud and use screws with heavy threads, or very short wall/hollow-door anchors, you should be OK. Most of the time, about 3/4 inch screws are plenty. If you don't over tighten them, our screws (basically sheet metal screws) have held very well without the anchors. I usually do pre-drill the holes just through the top panel so the panel material doesn't split on the back side. You can always put the anchor in if the screw doesn't hold by itself, since it requires a bigger hole. But, do watch that you don't poke through that outside wall!
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