DO NOT TAKE THE SYSTEM APART! They work off pressure once the leg has weight or pressure on it the computer sends the fluid to the other cylinders till all cylinders have weight or pressure on them and then they will work in sink.
My last Toy Hauler I had a custom install by Lippert components.The designer of the level up system taught me how to use my custom made system. As soon as I seen the legs did not come down in sink I said we have a problem he said nope it's designed that way to keep from twisting the coach.