I was unloading my sled off the trailer last night and there was a part of my sled laying on the trailer on the left hand side. A small rubber cover 1 1/2" X 2 1/2" that has an arrow and the word forward on it. I have never noticed it on my sled before, and I have looked all over to see where it came from. the underside is in the shape of a T that it must go over. Any ideas? Thanks.