If you have the rear overhead cabinet you could do a permanent solution as I did.
I cut two 1 inch dowels to size to fit on both sides of the trailer. I painted them white and ran screws from the inside of the cabinets into the dowels.
I mounted them far enough from the windows
in case I ever need hanging clothes, the hanger/clothes won't hit the window. This also allowed for me to add little shelves behind the rods. I use the streetside for kitchen towels and the curbside for bath towels.
Here's a couple of pictures.