Never used a WDH on the MH and have never seen one used on a MH with air bags. It would seem to me that any adjustment made to the WDH would be negated by the air system.
I typically don't hook up my cargo trailer with the MH running because it is too loud but the few times I have as soon as the tongue weight of the trailer is felt the air system pumps back up to level. Wouldn't this be the same effect of the WDH? As the air levels out the MH and trailer it is spreading some of the tongue weight to the front of the MH and some to the trailer axles. Being the center pivot point as you raise or lower the air suspension it should push some of the weight in either direction.
I have no experience with a WDH as I have always added air bags or upgraded springs to level trucks and trailers so I am probable missing something but I would think that you either need the air suspension or the WDH but not both.