I think that one danger with dual leveling valves would be the slow nature in which they move air. If you were in a situation where one side is a good bit down hill and the valves have leveld the unit then if you suddenly moved forward to a place that sloped in the other direction there would not be enough time for the air bags to adjust and the previous down side would throw the unit off balance if only for a few moments.
I would take a good hard look at the chassis on a level floor with the eye at the low side front spring and spring shackle. Even the frame rails are suspect.
Wick
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