My vote is for curtains with homemade "shades" of Ron Loc (blackout fabric) that you hand roll up or down. The Ron-Loc fabric is mounted on a dowel or a second curtain rod that simply sits on top of the curtain rod supports. I sew Velcro (hook and loop fabric) on the bottom so it adheres to the "Rat fur" wall. I have the light-colored stock curtains in the middle and add 9-10" side curtain panels according to my decorative whim (purely optional but fun for the "glamper" in me).
When traveling, at night or during a sunny, hot day I keep the shades in the down position to keep the sun from damaging the interior fabrics and to keep the interior cool. When I want to have light
and air I roll up the shades, open the curtains and hold them back with my tie-backs which also adhere with Velcro. See photos. One photo shows the curtains in the open position, held back with the tie-backs and the shade in the down position. (It was easier to take a photo this way rather than with the bare window letting in too much light