I recently saw a late model (1999-2006) 1500HD crew cab with a matching stepside bed. It really looked no different from the extended cab stepsides that the factory produced, so it didn't stand out so much until you realized it was a crew cab. (Not that this has anything to do with our trucks).
As a known fan of stepsides, I'd like to see what this looks like on a 73-87, as well!