Review on Guardian Industrial Truck Laminated Rubber by Jason Bolden

Use this to hold my boat trailer up a very steep driveway. I had smaller wheel chocks that I tried to use but it seemed like the wheels could accidentally jump over them at any moment so I decided to look for bigger/stronger wheel chocks and when I saw them on Amazon I knew that they were up to their task. They are very heavy and the rubber sticks to the asphalt and trailer tires like glue. Since they are rated for 50,000lb semi trailers I am confident they will hold my 3,500lb boat/trailer in place.