I have recently purchased my first jeep, it is a Jeep Rubicon unlimited. My question is: I like to just fold the soft top back, in the Sundowner position. My owners manual recommends taking out the back window when traveling this way at speeds over 40, but it doesn't say why. Does anybody know why? It's really quick and easy for me to just fold the front part of the soft top back and go cruising without removing the rear window, but am I damaging something by not taking it out? Thanks for the input guys.