[Richard]

It’s hard to believe 1.25 inches in the back would result in 4 inches in the front.

I am just going to throw out some ideas.

There have been a few occurrences where either the down solenoid stuck partially open, or the raise solenoid stayed partially open which resulted in odd behavior such as one side unexplainably low or unexplainably high. Tom had this happen to him on a trip. Debris in the solenoid could cause this.

It might not hurt to check to make sure the down solenoid on the left or the up solenoid on the right is not getting a signal from the HWH brain.

And take a look at the sway bar to make sure something isn’t amiss with the sway bar mounts.

I am impressed with your ability to carry out experiments to confirm your theories. I also appreciate your willingness to publish this adventure in real time. It may help others who are following, and someone who searches in the future to gain a deeper understanding of how the air suspension system works. I don’t have the statistics but it feels like this is an often repeated subject.

If you decide to adjust the rear HCV. Take a small amount of grease and a 5/16 nutdriver with you and slip between the drive and tag tires. Feel around on top of the drive axle and find where the vertical rod on the HCV attaches to a boss on top of the drive axle. Lubricate the end of the boss. Slip the rod off the boss, and pull it down. You should now be able to reach the clamp on the rubber “P” that holds the vertical rod in place. If you twist the rod and push or pull, you should be able to make the adjustment. It’s just about 1:1 in the rear. Move the rod in the direction you want the coach to go. Don’t forget to tighten the clamp when finished.

And I got the zebras reference.