We don't have an inside solution yet, but I like the expandable rod in the shower idea.
Our first trip with the new camper involved a lot of swimming. We hung wet stuff over the 'dog run' cable outside. We carry a bunch of binder clips in different sizes and use them for clothespins, chip clips, to hold the tablecloth down, etc.
Also for outside drying, I accidently discovered a few years ago that if you are putting up a clothesline, if you double the line and twist it, you can separate the twists and put the wet clothes in between the strands. No clothespins required. Works great.
Family of six, camping in a Grey Wolf 26DBH LTD pushing a 2010 Armada via 10k/1k HaulMaster WDH stopped by a Prodigy P2 brake controller
Tug: 2010 2wd Nissan Armada Titanium with tow package.
Specs: Max Trailer Weight 9,100, Tongue Load: 910, GCWR: 15,100, GVWR: 7,150, Payload: 1,592