Our coach is on a Freightliner chassis. But the ride height adjustment is usually something that would be dictated by the Chassis makers. You can peek under the coach. Our coach has a height sensing valve at the left and right front airbags. And a single height adjuster on the rear main axle…. The valve is usually bolted to a frame rail…it has a supply, delivery, dump, and exhaust tube(s) coming out of the valve. The valve has a horizontal arm which adjusts…connected to a height sensing arm that have bushing on each end. The chassis maker will have a drawing showing the reference points…and the process. Ours has you disconnect the sensing arm…move the valve arm down 30 degrees from horizontal to deflate the airbag…then up 30 degrees from horizontal to inflate the airbag until the height measure is correct. When it’s at the correct height move the valve to the centered horizontal position to lock that in. Then adjust the end of the arm to remount the height sensing arm at that level. It needs to be done in a level surface…and you should adjust all of these heights before completing…because they can affect one another.
Photo is a representation of the valve body and height sensing rod.
The ride height adjusting valves may not be the issue. There is a system used to dump the bags, which may have not shuttled bag into the correct position for reinflation, etc…. If it’s just a bit off,,,that’s when I would think about ride height adjustments.
