I knew a man that towed a trailer from a park in Colorado for his brother in law. The morning that he left to take it home, his wife and her sister (new owner of the trailer) had slept in the trailer overnight because he wanted to leave very early in the morning. He had already hooked the truck up to the trailer, so he just got in and took off down the road. They had planned this, but didn't think about a large moose running out in front of them, and since they had no warning of the quick stop, they both were thrown on the floor. I think one of them broke an arm, but it could have been pretty serious.