Originally Posted by Jester65
snip...... could airbags help level out the truck?
They may, but IMO trying to level the truck should be a low priority. Sounds like not enough weight has been transferred to the TV's front suspension which can result in TV steering and handling issues.
With your '08' GMC you want the WDH adjusted to return the TV's front fender back to it's "unhitched height' (return same weight) after you have your WDH engaged, and it's normal that the rear of the TV will still squat 1" - 2", most TV's will....., because obtaining "equal squat" with today's TV suspensions is a tough task. Once you have the TV front fender height set correctly with the WDH, then check to see if the TT frame is level. Adjust the WDH ball mount up/down to obtain a level TT, or a "slight" nose down attitude.
Is the WDH sized correctly for the 29N? It should be rated at no less than 800lbs, or 1,000lbs maximum.., anything heavier could bend the TT A-frame. My BIL had an '06' 29N and he used an 800lb rated WDH, and his TV was an '02' Avalanche.
Even with a level TT the weight loads on the axles can very, depends on floor plans, loading habits, etc..
If you want to refine your WDH adjustment, a visit to a CAT scale may be helpful: http://www.jaycoowners.com/showthrea...igh-Your-tt-tv
Note: With your '08' GMC don't try and force the TV's front fender height "below" it's unhitched height, doing so compresses the suspension against the suspensions stops creating unwanted handling.
Hope this helps