News had a video of it last night. Looks like the truck went over a small jump/drop off and didnt land quite straight. He went off the left side and rolled it into the crowd. They said the driver was Brett Michels if I heard correctly. Both him and his copilot/navigator had to flee because they were getting stoned by spectators. They said 8 dead 17 injured.
I can't see it at work but, I believe this is the video.