buy some black out drapes... you can get them anywhere from the dollar store to high end department store. You can make enough for several RV windows from a single drape. mount them with velcro inside your valances. When you want them open tie to side or either fanfold up and tie up like roman shades.
I personally use the reflectix.. It is not that difficult to slide behind the blinds. the one piece I have issues with is the one on the door in the bedroom of my TT. The southern sun keeps softening the glue on my velcro. Guess I need to buy a better grade. oh yeah I don't use velcro on the other windows. push under the shades and valance and sit bottom on window sill.