MaxxHaul 70074 Tandem Wheel Chocks are designed to minimize wheel movement and rocking while a trailer or vehicle is parked. They are adjustable and can be used if there is a 1/2" to 6" distance between each tire. The chocks are easy to set up and use, and they come with a padlock hole for added security. They are also a great way to prevent theft of your trailer or vehicle.