I don't think its restricted to small cars. I had simular things happen when I was driving my Ram 3500. Usually with ricers doing the dirty tricks. Obviously these are morons who don't understand the fundamental laws of physics. When a 7K lb object hits a 2K lb object. The 2K lb object looses. End of story.
I had small cars so close to my rear bumper that I could not see them over the tailgate. I am starting to like Germany's traffic laws. they help keep the idiots off the pavement.