[Richard]

Ok, here goes. It is all about twisting the frame. In the travel mode, the coach is actually suspended on a triangle. How so? There are only three height contol valves. One for each rear, and one only for the front. The right and left air bags for the front suspension are tied together pneumatically when in travel, so that the front is free to float side to side. The side to side movement while in travel mode is completely dictated by the rear height control valves.

Now when you put in level, each air bag is isolated by the six pack solenoids. The front air bags are no longer tied together. They are now separate. Even though the leveling computer is supposed to only level side to side, or front to back at a time. It is entirely possible when you level the coach to impart some level of twist to the frame.

Think of it in this totally oversimplified way. If you have a three legged stool, no matter how uneven the ground it is sitting on, each leg will touch and have equal weight. If you have a four legged stool, it is completely possible to have one leg not touching, and easy to see that one leg is not equally loaded. Imagine for a second that the top of the stool is not solid but somewhat flexy. On a four leg stool on uneven ground, the top would flex until all four legs had equal weighting. That is what I am trying to explain when I talk about the difference in coach air bags when in travel vs level. The key is the front air bags are connected in air pressure when in travel. Air pressure being what it is results in equal force on both sides of the chassis. When the air bags are isolated in level mode, then it is possible to have different air bag pressure side to side in the front.