Camco Wheel Stop w/ LockOnly use one piece of equipment to stabilize your trailer: Camco Wheel Stop w/ Lock. Camco's Wheel Stop secures tandem tires to prevent moving while parked or rehitching. This lightweight and durable wheel stop features a lock and a zinc-plated steel locking bar for added security. Has an easy grip handle for easy installation. Fits 26" to 30" diameter tires with tire spacing of 31/2 inches to 51/2 inches.