It won't cause sway, but it won't improve it either. When making a turn, the natural lean will cause air to move from the compressed bag to the other. This will simply allow the MH to sway as it does now. If the MH does not have any objectionable sway now, it won't get any worse with the bags.
With each bag filled separately, you can balance lean (if any exists) and it does help to prevent some sway.
I have my front bags separate, and plan to leave them that way.
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'97 Bounder 34V, F53 7.5L-460
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