What is the piece of equipment in front of this NW DC-9? It looks like it is surrounding the front wheels. It looks like a push back truck of some sort, but I have not seen anything like that push out a DC-9 before. I probably have seen them before and never really paid attention. What would be the advantage of using a truck like this as opposed to a truck with a bar attached to it?
Sorry for the poor quality photo, but I took it out of window a neighboring DC-9.