Camco Fasten leveling block set helps quickly stabilize an RV or trailer when parked. The unit is a square-shaped platform that provides a flat, stable base for wheels or jacks. It can be used on different surfaces. The block helps eliminate sloping and ensures the most accurate vehicle positioning. The elements are made from high-strength polymers resistant to mechanical stress and weather. A special handle is provided for easy installation and transport. The blocks can be connected to each other to create the required height. The design can support large weights, comparable to light and medium RVs.