We have a passenger van that has windows like an airplane. They are square, 8" x 20". They are made of plastic. I like windows and don't want to put reflectix on them. IKEA has some room darkening pleated shades. They have an air pocket between 2 layers. I read the thread about velcro and different glues. I am thinking about using tension curtain rods. I can only buy the small size online, so before I buy 10 rods, I was wondering if anyone has used these type of rods in a vechile. Do they stay in place? Do they damage the plastic due to the level of tightening required to not fall down? Any help would be appreciated!!