When my day night shade broke on the road in sweltering Florida in summer I picked up room darkening drapes and a shower curtain rod at the Dollar Store of all places!
Real inexpensive, look great and did the trick until I could get the shades repaired......only thing is they look so good and work so great for keeping the sun and cold out....I decided to leave them up and buy another pair for the other side window!! :B
I put them over the day night shades. One tension shower curtain rod fits perfectly under the valance of RV windows. Open them when I need them, close them when not needed. Makes a big difference in winter and summer in a MH.