I had that happen to me once. I didn't wreck, but came close enough to hear the tires squealing. That was the last time I trusted anyone to load a car, and the last time I would use any trailer other than my own. The fricking thing whipped me around when I hit 40mph. I tried the breaks, but it made it worse. All I could do was push the clutch in and ride it out. Scary shit right there.