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 bought the orange ones, because of the weight.. and hopefully not having to get in out a dozen times.. the platforms like ECONES shows are great, but 25 pounds and that's dry.. wet would be more than I want to pick up..
You asked about chocking.. if you get rubber chocks, you can wedge them in front or back of the tire on blocks too.. I trust my rubber chocks more than plastic.. may even try them with the arc part of my new plastic levelers.