WOW. That's some scary stuff. I take it it's not your truck, but like a company truck?
Sounds to me Ford owes someone a new truck... If that part hasn't been touched by anyone since it left the showroom floor, totally sounds like a warranty claim to me. That is if it is that new of a truck with that low of miles.
What could have happened, assuming it's the normal run of the mill base model 2wd fleet truck, was the wheel bearing was set too tight from the factory. Overtime and long drives, this causes heat. Heat burns away grease. Grease is gone much more heat builds, eventually causing the bearings to seize. Seized bearings caused the spindle that the brakes and bearings ride on to snap. Thus throwing the wheel with the brakes attached to them. That's my theory.
'01 XLT disguised as a '03 Fx4 Level II
Big. Loud. Slow. Bright.