Yea- I've had one back there for years as well. You don't need to take up the entire window with the piece however. Simply cut a crescent moon shape out of it (about 6' in height) and that should do it. Scott had a post years ago that provided a template for the cut. Putting that entire layover on the window looks terrible & it's not necessary--you'll get the same results with the trimmed effort. Save shipping costs and go to your nearest RV supply place
George, Cary, & Roxie the English Bulldog..''99 silver #1897