I've learned so many things from our friends Terry and Greg, so many Airstream tips and tricks.  This one is the red and white conspicuity tape across the back of the trailer.  Apparently Airstream wanted to make the rear end more visible, and so they sent out two tiny red reflector stickers.  Can you see them on the lower part of the back end, above the bumper?  Kind of ridiculous, right?  The conspicuity tape really works.  Plus, it's so much fun to say the word "conspicuity".