A few weeks ago on a hot day, as I started driving I turned on the A/C and opened the back windows all the way to blow some of the hot air out. I soon heard a tremendous racket from the back. The cargo cover, which is like a horizontal pull-down window shade, was acting like the Tacoma Narrows Bridge in that famous film of it bucking all over the place before it finally collapsed. I quickly learned: Don't do that!Kind of reminds me of when people complain about the thunderous sound in their car when only their back windows are open and they're driving fast.. It's all cars, and physics at work, so we need to accept some things in life.