Can I use a WDH on a DP

discovery4us wrote:
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.

Adjusting the leveling doesn't significantly change the axle loading, it just makes things level. The only weight shifting would be due to the center of gravity of the motorhome being above the axis around which it rotates slightly when being leveled, and so move a teeny tiny bit towards one end or the other. It's utterly negligible, perhaps even to the point of being nearly impossible to measure with ordinary vehicle scales. You would get far greater weight transfer by having a passenger move from the rear to the front of the motorhome.

A weight distributing hitch simply applies a torque to the hitch point, which has the effect of increasing the force (weight) on the trailer axle and the front axle of the vehicle, and reducing the force on the tow vehicle rear axle. Due to the lever arm lengths involved in a motorhome vs. a pickup or SUV, the amount of weight transfer in the motorhome would be comparatively smaller (I think--I haven't actually sketched out and solved a free-body diagram).