I was trying to back the boat off of the trailer and it wouldn't budge. I thought that it may be that I'm not backed up enough. So, I signaled for my wife to back it up some more. The transom was very close to going under and the boat wouldn't come off the trailer. One of my kids said, "Dad, the trailer is going sideways. " At that moment I realized that I forgot to take one of the transom tiedowns off. I reached over the boat into the water and flipped the lever on the tiedown. Everything went normal and the boat came off the trailer. I never did find that tiedown.