I saw a truck pulling a trailer that was nothing but a huge ball of fire. He was flying around a dirt lot in a construction area. He was even catching some air over some of the rough terrain. There were large balls of fire scattered all over the lot. I went by later and saw the truck after the fire dept. put it out. The trailer had one of those square hay bail shredders on it. I guess somehow he caught the trailer full of hay on fire while spreading it on the lot.