Lorry picture

Coming back from shopping this morning I was behind this lorry going up the hill and was struck by the picture on the back. I always have my camera on the seat beside me and, as we were crawling up the hill, I made this photo. I never found out what it was carrying as I had to turn right 200 metres later at the top of the hill. I reckon it's a flour carrier because it looks like a mill on the back. Never seen a lorry like it and it beat my abstract B&W photo of a stool in the shadows of our lounge window which I've added as an extra.