Originally Posted by Steve 6919
Ron, I have an Eze-Lift hitch with 1000# spring bars. I drop the trailer tongue on the hitch ball with TV engine running. Everything immediately levels out - TV and trailer. Then I connect the spring bars. No apparent load on spring bars. After traveling I unhitch and there is still no load on spring bars. Everything is always level though.
Steve, I think the lack of spring bar load is not caused by the air leveling system.
I think the problem probably is related to the initial adjustment of the WDH.
First, what criteria are you using to define when enough load has been transferred to the front axle?
I recommend you use the procedure defined on page 9-78 of the online 2015 Yukon Users Manual
It helps to put a piece of masking tape on the fender above a front tire and draw a horizontal line on the tape to use as the reference measuring point.
When the WDH is properly adjusted, and with the leveling system activated, the height of the front end should be approximately the same before hitching and after hitching with WD applied.
I'm guessing there might be a couple problems with the initial setup of your WDH:
1) There might not be enough rearward tilt of the ball mount. How many spacer washers do you have on the rivet between the ball mount and the shank?
There can be as many as eight washers, and you probably should have at least six.
2) You might not be applying enough leverage to snap up the lift chains. Are you using the "lever bar" to rotate the lift brackets into position?
Can you hook in lower down the lift chain so you have fewer links under tension? Doing so would increase the amount of force applied to the WD bar when the chain is snapped up.
You also can try snapping up one chain and then have one fewer links under tension when snapping up the other side.
Then CAREFULLY unsnap the first side and decrease by one link under tension so both sides have the same number of links tensioned.
This "stair step" process can be repeated if necessary.
Normally, people use the TT's tongue jack to lift the rear of the TV and the front of the TT so the lift chains can be snapped up with relatively little effort.
Unfortunately, this procedure doesn't allow you to comply with GMC's instruction to allow the TV to level and then attach the TT.
Another approach which some people use is to initially "overadjust" the WDH with the leveling system deactivated.
This will result in the TV's rear end being closer to the "level" height and the front end being below the desired front-end height.
Having the rear end closer to its final height means the air leveling system doesn't have to do as much work.
Then, when the air leveling is activated, the rear end will be raised to normal ride height causing load transfer to the front end to be reduced, and the front will rise.
With some trial and error experimentation, you can determine how much initial "over adjustment" of the WDH is required so activation of the air leveling causes the front end to be restored close to its unhitched height.