So I really want to but 20" on the rear and move my 19" up front. I have a few questions though. I'm assuming I can use the rear 19" for the front, right? Also, is it a good idea to do this as I know some of you have, but I have heard that it is not good to do that to a car because it was not made for bigger rim sizes than what it has and that it adds tension to the suspension, and that it's just not a good idea. Is this true? Could you 20" rear people post some pics too? Thanks!

-Sam