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...
Does look slick. Probably easy to make one and try it out. On a related note, camped at the Crandon Off-road races this weekend. Never before have I seen so many campers of all types where no attempt was made to level. Side to side, fore and aft, there must have been a hundred campers just pulled up and parked on some very uneven ground.