I thought i would share this with you. It was posted on CO 4x4 and the video is from a shop in denver. It is an easy way to dismount a tire just using the vacuum from the engine. Pretty cool if you ask me.
http://www.youtube.com/watch?v=nZHMCQxALnU
http://www.youtube.com/watch?v=nZHMCQxALnU