Review on AFA Tooling - Set of 4 Heavy Duty Rubber Wheel Chocks for Camper, Trailer, RV, Truck, Car or ATV – Quick Grip Ribbed Design, Ergonomic Carry Handles by Corey Nyuon

These items are great. So much stronger than plastic. If you don't mind the weight (they're 14 pounds), they will tie your trailer down VERY securely. I've dealt with plastic before. They will NOT let you accidentally bump into them. It's almost impossible to compress them for this. They are ideal for most tires. Definitely hard mode. 5 Stars.