If the original poster wants toolboxes on a bed that looks factory (at least somewhat) rather than a flatbed or a utility bed they do exist. I am not sure if one of the companies in bondo's post is this type but I talked to a guy that had an F250 or F350 that had a bed like that. It had the rounded shape of a factory bed but the sides opened up into tool compartments. The guy is a firefighter and has a woodworking business as well. It worked well for him because he could stage his fire equipment in the boxes ready for a call but locked. It was a nice looking box.
He said it came from Utah, I think, and was about $8000.