Bones
Well-known member
Not sure about the earlier trucks but since I just read my manual I thought that I would post this.
Granted I have not used mine. But I skimmed through the book and the 2017 has a few different settings. The regular ride height is maintained at all times with no operator control, alternate trailer height lowers the rear 1 inch so the truck is level from front to back, there is a jack/tire changing setting for when you are jacking the truck off the ground, it prevents any adjustments to the air bag system. Finally there is a zero height setting. This is only to be used when the truck is being trailered or put on a flatbed, it takes all the air out of the bags and there is a warning about not adding weight while in this setting as damage to the bags may occur.
I know this system was new for the 2500 & 3500 trucks in late 2014 but there are big differences between them. The 2500 has no steel and all air bag rear suspension. The 3500 maintains the springs with assistance from the airbags. the bags will maintain the regular ride height up to GVW. So if the rear starts to sag under load it is a visual warning that the truck is overloaded.
It's the same as mine so there should be a button on the dash. I just want to add that I love this feature