Our previous trailer had a niffty towel rack on the door and DW liked it so much I made one like it for this trailer and mounted it to the door permanently using the afore mentioned "moly bolts". I made it out of some oak flooring I had laying around, but you can buy red oak planks at Lowes also. It's an easy DIY project that anyone can do fairly easily. We use it mainly to store clean towels for ready use and to hang dry towels that are currently being used. We also have a couple of the over the door hooks, but like the permanent rack better since it keeps the towels close to the door and they don't fall of when traveling.
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Larry