I usually see the F-450/550/650 tow trucks and the sort. I’ve also seen some fire departments with them for some specialty type vehicles.

Depending on the configuration, the lower end of the GVWR on the F-650 is 25,600lbs, while a CDL is required for anything above 26,000lbs. I’ve definitely seen a couple of people with them as “personal” vehicles, but they’ve all been show cars of some sort.