[BRUTAL]

My point on this I am trying to relate is this, yes while you dont have to run down and get an alignment, you have no idea how much the tire swap will alter the toe, and yes any change in ride height does change toe. I could show you this by pushing up and down on a car while I have it set up on the alignment rack and you can watch the toe more than anything else swing in and out. And toe is the biggest wear angle in your suspension, get it wrong and youll wipe out tires in no time. At the very least get the tread depth indicator, monitor inside and outside tread wear, also run your hand fore and after on the tire, in you feel feather edging where it catches your hands(sharp ridges) one way and smooth the other way or scallopping/cupping where one tread block wears lower that the one before or after it. Like Houdini linked(I didnt read or go) but there are lots of good articles and pics on the web. Educate yourself so you at least understand whats going on and can speak to the person doing you alignment on whats what. A final point is this any abnormal wear in the tires due to alignment suspension issues is going to increase your gas mileage and at todays prices that can easily hit you harder over the life of your tires than a one shot alignment charge. If its wearing the rubber off faster its increasing the rolling resistance and decreasing your mileage, the same as underinflated tires will. This is just food for though no matter who you are or what you drive......