These are the answers I thought I would get on this thread. The sellers said his "Research" found that that year was the only year this was offered, I thought his "Research" was wrong.
I see something that none of you have said anything about yet. Ford didn't make a 4X4 Dually tell 1999 as per Ford. There are a few out there and I have seen at least one that was a 1996 Supercab dually that had the front end put under it, when it was new.
If you look at the rear wheels, it's obvious it has spacers on it, notice how the axle hub only protrudes from the wheel a little bit, normally they stick out like 3+".
For some reason, I know...