You need to check out a documentary on Netflix if you have not already. It is Figure 8 School Bus racing in Bithlo, FL. Not a demolition derby, but when school buses go around a track in a figure 8 there will be interactions in the middle. Absolutely fascinating Americana. You have to get past the "community" environment, but it is well worth it. One of those documentaries where you say to yourself why am I watch this and then 20 min later you are still watching it. Kind of like the Cat Show documentary also on Netflix.