Perhaps this should go under a new thread RIDE HEIGHT, but with the questions asked here, thought I would update my findings.
Ride height rod length really depends on where the ride height valve is located (how high on the frame rail they mounted it. And, no reason it should/is the same side to side, as only the frame rail to axle dimension (the ride height dimension) is critical.
On our 2003 38' I took some measurements this morning:
Left front ride height: 11 1/2". Rod length (pin to pin): 8 1/4"
Right front ride height: 11". Rod length (pin to pin): 11 5/16"
Both are standard 1/4" bolts at both ends.
Could not lower either side to spec (10 5/16") by adjusting the ride height valve (the 5/16" nut that connects the ride height valve to the arm to which the rod attaches).
And, re-drilling the lower rod mound will only give you about another half inch-- not enough lower to bring either side into specs.
The good news: different length ride height rods are available and reasonably priced.
Here are a variety of fixed length rods:
And the same company has adjustable length rods in two sizes (9-15") and 15-26". Here is the shorter one: https://www.heightcontrolvalve.com/shopexd.asp?id=109
Remember, ride height is critical in front, as change in ride height changes CASTER on our "trailing arm" design suspensions which can cause the coach to pull to one side. In my case, with the left front side ride height quite a lot higher than the right side, left side caster is greater and the coach pulls mildly to the right. Caster should always be a little more on right than left front to compensate for the crown in the road.
And, in back, out of spec ride hight can accelerate U joint and transmission output shaft and/or vibration.
2003 38' Alpine