Chocks are required for safety. They prevent tires from rolling and sliding. Never park a trailer without using chocks.
These super lightweight chocks weigh less than one pound each and have a grooved, contoured surface for better grip. They will last for years and properly keep your trailer from rolling when parked on flat or sloped ground.
The bright red color reminds you to remove before towing, and a handy nylon cord makes it easy to remove the chock when finished.