Camco RV Small Wheel Stop stabililizes the trailer by securing tandem tires to prevent movement while parked or re-hitching. It fits 26" to 30" Diameter tires with tire spacing of 3-1/2 to 5-1/2". 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 1-1/2" to 3-1/2