On my Monaco I had some trouble with front tire wear, turns out the right side was nearly 1″ low even after Monaco had spent thousands. While ruminating over these automatic MAC valves, I parked beside a later mogel Diploamt that had air leveling, mine had hydraulics. I thought it over and my experience and left over parts decided I could do this. I ran some air lines and added the dual Firestone ride rite level controllers and now have full 4 way leveling both for travel and sitting. I have sat for 3 months with out having to readjust the level. This is one great mod.  ,