Each JT's Strong Arm stabilizer tube bolts on to each landing gear leg and to the RV frame, forming a rigid triangle to eliminate unwanted chassis movement and provide a rock-solid camping experience. There is no welding required and no need to remove and reattach during setup, it's permanent! When parked JT's Strong Arm Jack Stabilers telescope into place with the jacks. The patented universal system is designed to attach to the three main types of jacks found on RVs: scissor, front landing gear and telescoping. Additional hardware may be required. JT's Strong Arm Jack Stabilizer Travel Trailer Kit includes 6 stabilzer tubes for landing gear 58" or more apart and all the hardware needed to complete the installation - 4 attach to the front of the coach and 2 on the rear.