Air Bags

Ron Gratz wrote:

Campin LI wrote:
When WDH is engaged, front is higher than unhitched by about an inch and back is down by about 2 inches. When air bags are pumped up to get the rear back up to unhitched height, the front does not go down to unhitched height, it is still a little high.---

When you use the bags to lift the rear of the TV, you also are lifting the hitch and the trailer tongue. This changes the vertical angle between TV and TT which has the same effect as tilting the ball mount forward. The load on the WD bars will be reduced, and the amount of load transfer will be reduced.

Reducing the load transfer will cause load to be removed from the TV's front axle. The front of the TV will tend to rise.
Whether the front actually will rise depends on the amount of friction in the front suspension components. The front might not rise, but you should not expect it to drop.

On edit: To be more specific, No WDH - hook up trailer. Front is way up (not sure how high, maybe 3 inches?)and back is down. Pump up airbags and as back goes up, front goes down. This happening is what I don't get.

Does your TT have independent axles or does it have an "equalizer" link between the front and rear springs?

If you really want to understand what is happening to the front end you'll need to measure the axle loads under the various conditions. Height measurements often are not a reliable indicator of loading.

Ron

The trailer has an equalizer link between the 2 axles.

I realize scale numbers would explain a lot. When I posted the question, I kind of thought there would be 20 replies with the same answer. I'm actually surprised there is no overall consensus on this.

I have to believe the suspension has a lot to do with it. Or the WDH actually equally distributes the load across the entire TV chassis and the angle the truck makes with the road surface has something to do with it, ie by raising the back with airbags more load goes to the front axle because the truck is level. Not sure.