Lynx Recreational Vehicle Leveling Kit. Modular designed levelers not only configure to fit any leveling function, but they also withstand tremendous weight. To use: simply set them into a pyramid shape to the desired height that the RV needs to be raised and drive onto the stack. The levelers can also be used as a support base for other stabilizing equipment. Use under single and dual wheels, under tandem axles and under jacks. 8-1/2 inch x 8-1/2 inch with 1-1/2 inch thickness to give 1 inch lift.