[Richard]

I do not have a working knowledge of your coach so take this for what its worth. I am confused a bit by your post. You speak of adjusting pressure in the air bags and also of ride height control valves. Forgive me, but it aint both. If you do have air bags and you do have height contol valves then the hcv automatically adjusts the pressure in the bag to acheive the ride height. All of that assumes you have enough pressure to raise the system. You adjust the ride height by adjusting the distance from the axle to horizontal arm on the hcv.

So before I go down the wrong rabbit hole. Do you have air bags? Do you have height control valves?