Most likely someone dropped a Fleetside bed on what was originally a Chassis Cab truck would be my guess.
Rick,
I like your thinking, however this truck had the trim package on the doors and fleetside bed, so that makes me think the bed was on from the factory.
I can live with not knowing why there's a 3 instead of a 4 but since I am an information junkie, I thought I'd ask the forum.
