I have never heard of anybody damaging these either, but I have always been an Abundance-of-caution type of guy that just can't allow camp time to be marred by the unlikely breaking, or bending, of a jack tube. Because, lets be clear, if it can happen, it will happen to me. Even saying this, I use them exclusively to level the trailer as long as all four tires can touch the ground. Once they hang, they get blocked.