Valence, cornice, lambequin, I believe Deuce is talking about these things that go around the windows:
These are invariably upholstered with the ugliest fabric available. In a previous trailer, I removed them and replaced them with ones I made from oak and stained. If you have miniblinds, they are function in the sense that they keep the blinds from bouncing around when in transit.
If you have pleated shades, they don't do much to keep the shades in place (since the shades are tethered) but visually they do hide the top bar, and as was noted, offer some light protection on the sides.
I removed them in our latest truck camper project and never looking back!
