When I bought the Rolling Steel Tent the back windows were covered with perforated vinyl. That was good, because it helped keep thieving eyes off the contents of my van. Yet I could also see out.
But the vinyl was a little ratty, and in the past few months it had gotten worse. It was time to replace it. It took longer to deal with the guy in the sales office than to have it installed. Hey-presto, job done in ten minutes.