Helps prevent trailer movement. Easy to use, easy to store. Place Wheel Stop between your tandem tires to prevent both forward and backward movement while parked or rehitching. Wheel Stop installs easily beween tires, stabilizes your trailer with one piece of equipment. Available with or without lock. Small Wheel Stop is designed to fit 26” to 30” diameter tires with tire spacing of 1 1/2” to 3 1/2”.