Hey I came up with a little idea, In my opinion it is probably really easy to make... I drew a really crappy sketch <just work with me here> maybe we can have super flat side view mirrors, like 1/2inch thick type of flat... then when we need to actually use the mirror, we can press a button, or even pull a cord and it make the mirror, that is flat inside of the mirror outer shell come up, making the mirror about 2 or 3 inches thick, then it collapses back to the 1/2inch when your done with it... I hope you can understand what I'm trying to say...
Kink of like a Wink, its eyes are closed, you open it when you need it and the mirror slides out with a top hedge and when your done it slide back in and closes up.