We put some screw-in eye bolts at strategic corners inour 73 amerigo
(it has a wood panel lining all over inside) and use a stretchy bungee.
We can close off the porta-potti closet area, the main doorway, the back half from the front half, and Paul's bed/sitting area.
We use a very large beach towel we've been kicking around the house for decades...too nice to offload, but up till Peanut, of no use to us.
We use those curtain rings with the alligator-type clips on them, slid 7 over the bungee, clipped on the towel, and voila. We have four curtain positions depending on needs,
Paul can have some privacy, and I have privacy in a larger area of the trailer than the porta-potty "niche" we call the putin. I need extra space.
We already call Peanut our "two-bedroom unit" because of the two separated beds/sitting areas...this gives us extra flexibility day and night.
The towel hangs lower than the bottom of the mattresses but not clear to the floor.
There's that towel across the putin area...yup, it's a beach scene. Matches Peanut's color scheme, more or less.