[BigAl]

If you just have a set of holes in the side of the bucket for the steel bar to pin into in and retaining stops on the bucket so the bar can't go to far foward you can just drive into the pile and the steel bar will flip "back"out of the way so you can load .Along the same idea as a "one way check valve" design . That way you can load and when you go to dump the bar will return to it's blocking position to keep the whole load from dumping at one time .
Big Al