I carry lots of wood as we camp in spots that are soft or very off camber. Steel landing jacks feet just don't cut it.
Some times the pin is over head high and some times its 3' from the ground so one end or the trailer or other requires some type of blocks.
Now thats just fore and aft.
We also camp where the tires on one side of the trailer have 6"+ of wood under them and the other side tires are dug down to get a level trailer.
I also use wood blocks under my landing legs which eliminates leg wobble and I use either large blocks behind the rear tires and in front of the lead tires or I use my adjustable chocks. If your trailers legs doesn't have that kind of wobble then you need nothing to eliminate it.
These types of "look what I saw" threads are amusing at all the "why don't everyone camp or do it like me" comments.