The present invention discloses a swivelable trunk wheel assembly, which comprises: a wheel frame, a guide hole, a hollow pivotal shaft, a push rod, a press block, a sleeve pipe, two wheels and two rivets. In accordance with one embodiment, a first set of pads are configured in a predetermined pattern on the bottom surface of a flexible substrate. The processor-readable storage medium may contain one or more programming instructions that, when executed, direct the print job workflow management system to receive print job characteristics pertaining to a plurality of print jobs processed in the print shop environment.