Our last trailer had a towel rack/storage fixture on the inside of the bathroom door that we really liked and I made one similar and mounted it to our current trailer. This allows storage of three bathtowels and wash clothes w/o folding them so the dry better and w/o taking up any precious wall space in the bathroom. It's made out of red oak and secured to the door with moly anchors. Here are two pics of this .,.


For normal everyday sink use I have a single towel rack next to the sink ....

And for really wet items such as towels or whatever I put one of the expanding shower curtain rods along the back wall of the shower ....

Larry