go to camping world , that is the only place I have found these. They are a small level in degrees not inches. It goes to 6 degrees if you go all the way to the end. Put a level on the freezer plate in the freezer . Then level the trailer till the level on the freezer plate is level. Then stick the level on the front of the trailer above the pin box. Then put one on the side at the front. My ice box is good up to 3 degrees on the side level and up to 6 degrees on the one above the pin box. When I stop the first thing I do is look at the levels to make sure the ice box is okay. All the other levels I found were in inches. I wanted degrees since the ice box is what I was using it for.