provides added stabilization and prevents tire shifts by applying opposing members save best seller! extends 10" to 17" to accommodate wide track axle spacing deluxe deluxe ture locking chocx ble bal douceu includes padlock and 3 keys rv products group installs in seconds to hold trailer steady adjustable for wheel spacing from lifetime warranty eliminates front-to-back rocking motion when applied trailer or 5th wheel tires for added stability secure tandem tires to prevent movement while parked or