Huh...was it flood damaged or something?
Even though I have a hard time smelling concentrations of the stuff, try several applications of Febreze. They also make a heavy duty version for sports equipment, that might help you out too.
I just pulled the trigger myself in preparation for an upcoming road trip. Got a shell for the F350, was looking and not finding a Callen, or much of anything else. Finally found an A.R.E. cab height, with tool box on driver side, two driver side doors, single passenger side door with two windows, and rear hatch with window, and full heavy duty rack on top. Front bulkhead has a solid window. Not bad condition, not thrilled about the price, paid $900, but I'm in a time crunch so I'm semi-screwed. Once I get back from Arkansas I'll probably start looking again for a Callen or a tall A.R.E. or Caravan, but I'm finding that the long bed superduty models are not common.......