I had a slight jacknife while empty on a rain slicked road 2 years ago. I was stopping for a redlight on a cruve with slight banking going down to my left. When I was nearly stopped, I heard an odd noise, like grinding. Looked in my mirror and could barely makeout that the trailer was sliding into the next lane. Let off my brakes and tried stopping again only for the tires to lock up on the trailer and start it coming around again. Luckily, nobody else was around at the time.
head, I was talking about outrunning the trailer if you have a full load behind you and it starts shoving you down a hill to where the trailer tries to pass you. Can happen in prefectly good weather, if your already running at the governor when it starts shoving you and coming around on you, you ain't outrunning it.