Good point, Wick! I guess in that situation one should not make too sudden a move in order to allow the air bags to adapt to the situation. Otherwise I still think two valves is still the way to go.
One point on rereading your post, though, is that the leveling valves will level the truck to the axle, not to the ground; if the axle is a few degrees off level to "earth" with one wheel higher than the other, the valves will still keep the truck frame and axle parallel to each other. The truck will not level itself to "true level" if the axle is not "truly level". I hope I didn't lose anybody here.
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