I saw these a couple months ago. After our last trip with trying to get wood planks under the one side to get the TT level I searched and found these easy to use trailer levelers. I contacted Anderson...
I'm not real impressed - what's going to happen on surfaces like the picture above after a short period of time? Those things will sink into the ground which will cause you to put wood or plastic levelers underneath them. But I like gadgets too, so if it floats your boat, then go sailing!