This is my Optimus Prime Costume that I had made. It lights up and I can transform into the truck mode with the trailer. In the video, my leg is not completely under neath the trailer, but as you can see my legs act as the trailer wheels and the wheels attached to the front of the trailer appear as the rear wheels of the semi truck in vehicle mode.
Please see my other 2 related videos
I attended the Central Canada comic convention C4 for the first time this year 2010, and won "Best In Show" for my costume. Later that night, I won $500 for best costume at the bar on Oct30th.