I worked on Semi's and trailers for over 30 years, supervised 3 shops in 2 states.
My guess is BOZO put spindle nuts on with impact!
Seen it too often in shops that I did not supervise!
I have run many service calls for burnt out wheel bearings.
I have had to cut off races welded to spindles and polish spindles for new bearings to fit many times.
Front wheel bearings usually give notice way before they are that bad.
I also had a R front seal let go on a 1993 KW that I was driving and when I hit the brakes it made a hard right turn into a Jersey Barrier! Luckily it just scuffed up the wheel studs.