This is the same truck as the Volvo Recovery truck with some modifications. On this truck the collapsible rear bumper is removed and the frame extended. The deck is modified and used as the bottom of the box.

The box is a refrigerated unit with a Thermo King unit on front. It has a lot of lights on it and just two doors at the rear. Also here are some photos that were not shown with the recovery truck.

I am kind of partial to the straight trucks with tandem axles because I think they make for a nice working truck.