Let me add my two cents and my experience with the Andersen Levelers.
Andersens should not be trusted as your only chocks on the side they are on either.
I had the Andersen levelers and the chocks they came with on one side regular chocks behind wheels and a pair of fastway chocks between tires on opposite side.
I had the trailer come off the Andersen levelers on the other side.
From then on I added X-Chocks also on the side with the Andersen's.
Just my own experience using them I love them they make it so easy to level. Just as a chock not so much.