Is there a suggested way of making or buying privacy shades for the side and rear windows? I have a cargo van (no rear seats), but it has side and rear windows. I plan to keep a porta-potty in the back of the van, and would like some privacy if I use it. It would be ideal if they were attached by velcro, so I could quickly put them up and take them down. I might also want a curtain behind the front seats. Any suggestions? I just bought a used 2011 Transit Connect on Monday.