Concrete. It took 6 hours to float from one side of the cabin to the other side. I watched the airbags deploy and watched the dust sparkle and shine for hours while I was weightless floating through the air. The the side post was wandering closer and closer to me. I remember saying in my mind "This isn't nessisary." then all of a sudden it was real time again and my stomach felt cold and my legs hurt all the way up to my middle back. I felt like throwing up from below my stomach as my abdomen got sparkling cold. I spent months high a shit and remember my wife coming in the middle of the night to feed me more drugs like in Back To The Future when the guy scares his dad as darth vader. The days strobe light by and the ceiling fan was my best friend. I had to wear a corset just to go to the bathroom. I was told I was in the hospital for half a month. Could be? hell if I can remember. Good time yeah, good times. I will post a picture of my Ford Explorer. =)