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CPL Anymore info to go with your picture?
I think parking lights on top dates the truck to the seventies. If the mod is not terribly expensive I might put it on my want list.
Something to consider is if there are laws in your state that dictate the maximum legal height for the center of the headlight. I seem to remember reading something a while back about such restrictions in an article related to lifting trucks.
I suspect that the headlights being placed on the bottom generally makes it so that your headlights are slightly less blinding to oncoming drivers, especially with how high these trucks sit from the factory. I do agree that it would look good the way the picture above shows with the proposed swap, but there may be a practical reason for the way it is set up.