Turtle n Peeps wrote:
The bottom line is this. If you had bolts loosen up in a few weeks or months they were not taken to spec torque in the first place.
Again, read the article you posted. It explains why some, not all, but some bolts in some applications will loosen up if some kind of friction modifier isn't used. That may be Loctite, Nylock, castellated nut, jam nut, or some variation of that.
Many trailers recommend retightening lug nuts after being installed, even if tightened to the recommended torque.