I had previously purchased Camco yellow pads which was a mistake for me. I have a 36 foot trailer that weighs 9600 pounds. The Camco product slides easily when the wheels are not in contact with the chocks. I accidentally drove a trailer over one of the Camco chocks and smashed the chocks. Guilty! :(Heavy duty solid rubber stops were the perfect solution for my needs. They are heavier than Camco stops and more durable. Because they are made of heavy duty rubber, they are less likely to slip in place. Haven't rolled over one yet...and I hope to I don't but I have a feeling the pad will survive if I do I wish I had bought them in the first place Highly recommend!