"Carrie S".....Even though you may hate it, I would be careful taking it out. Either save it for when you sell the coach, because no one will want a shower curtain, or put it up for sale, because there are those probably looking for that set up that isn't available anymore.
If you can't find a shower rod, you might have one made. A local metal fabricator or even a muffler shop could bend you a rod. Add ends and a center support.
Don & Mary
2019 Newmar Dutch Star 4018 - All Electric
2019 Ford Raptor Crew Cab