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Its not really a crack. That's a seem that is just spot welded on the bottom where the bed floor and sides are joined. It may have been like that since you bought it. I'm curious as to what Ford will tell you. It's not a structural issue unless the spot welds underneath are pulling apart.
Mine is like that, and all 4 of the other ones I looked at were like that too. Like Scott said, just where it's spot welded and in between it opens up a little.
Yup! I had a 2007 Mark LT, and I thought about trying to make the bed "dustproof". I crawled inside with the tonneau cover closed and had the wife close the tailgate so I could see light showing through the holes..........I just told her to openit back up, because it would be a lost cause, there was daylight showing everywhere!