Camco RV AccuLevel mounts with screws to the front of the trailer and can be seen in your mirrors. The large ball indicates side-to-side leveling, while smaller second level shows front-to-back leveling. Brackets for mounting to fifth-wheel pin boxes are sold separately. Product dimensions: 11" x 2.75" x 1". Front-to-back and side-to-side leveling Can be seen in mirrors and easy-to-read Helps show when the RV is level Mounts to the front of the trailer Mounting bracket not included