Camco's RV Wheel Stop is designed to stabilize the trailer with a single piece of equipment. It secures the tandem tires to prevent movement while parked or rehitching. Stabilize the trailer with a single piece of equipment Secure tandem tires to prevent movement while parked or rehitching Easy to use and easy to store Fits 26" to 30" diameter tires Fits tires with spacing of 3-1/2" to 5-1/2