Originally Posted by wheat
Thanks this is the info I need. Is there a way to get close without a CAT scale?
Measurements at the wheel well work pretty well, but that doesn't work as well with airbags.
Measure your wheel well height from the top of the rim to the bottom of the wheel well at all four tires with nothing hooked up to the truck. Record those measurements.
Now hook up the trailer and do it again. Record those for reference only. The back will squat, the front will rise.
Now engage the WDH and measure again. The front should go back down to within 1/4" of where it was without the trailer. If it doesn't, your WDH may need adjusted. If it does, write that down.
Now put 35 psi in the airbags (or whatever you like best). The rear will rise. Measure the front and see how close it is to the WDH engaged but no air in the bags measurement. If it didn't move much, then enjoy the tow. If the front of the truck got higher, then you might want to adjust the WDH a bit to get it working hard again.
I know my airbags will raise the rear 3/4" with 35 psi. That was enough to make me tilt the WDH one washer. Not a big deal, but it was nice to keep it all set up properly.