Arden-
On my '06 Monterey the ride height (travel mode) is factory specified at 10 inches for all bags. That is measured from the bottom of a bag's top steel mounting plate to the top of its bottom mounting plate.
I, too, have had, since new, problems with the coach going out of kilter, but only after it sits for awhile. It's usually noticeable anywhere from 12 hours to several days after parking, whether left in travel mode or leveled for camp. If leveled for camp, the auto-leveling system sensors, if used, will maintain that position until the air tanks run empty of pressure. It's been an annoyance to park on our slightly off-level home "pad", because within days the streetside rear slumps down and twists the body, even once causing the (as it turns out, mismounted) windshield to crack.
My ride height has been checked so many times by so many different facilities that it ain't funny. Problem is, it isn't the ride height that's the problem for me; it's the parking height maintenance. When you take the rig in, they always want to check ride height, find out it's to specs, and assume all is well. That's because, so I've been advised, it is next to impossible for a tech to track down a micro-leak, even if there is a glaring clue like my sagging left rear (no snickering you Guys!). One serious problem for me has been my shortness (okay, okay, stop the giggling); at 36 ft., my rig has a very short driveline, so the rear can't go to the full 4 inches of maximum lift when trying to clear street dips, etc. because they installed Limiting Straps that hold the back from going higher than about 2 in. Guess what happens to my mud flap and hitch when I go over a curb with the Raise button depressed, and the front bags are 2 inches higher than the rear ones! So I have to try and micromanage the Raise button to lift only 2 inches. A pain in my sagging rear.
Over time, leaks will develop anywhere in the system, and your coach is 11 years old. If your tanks are pressurized as they should be while on the road, then they should be able to keep up with all but the most glaring of leaks, so your travel (ride) height should maintain while driving. Bleed down while parked could come from failing valve seals, loose fitting nuts, rock-damaged lines, or failing rubber or fittings at the bags themselves. It would be nice if we could just fill the system with neon infused air, turn out the lights, and use a black light underneath the rig to pinpoint the leaks, but reckon that ain't gonna fly. I've never been able to convince a tech to try and track down my microleak(s), as they don't have that kind of time, and claim it's an impractical task; now that it's out of warranty, it sure ain't gonna happen. But if your air system is HWH, a call to them might glean some good advice, and you could spend your own time, instead of $$$ on tech time, zeroing in on the problem spot(s). At least you know it involves the front, so that's half the battle, and HWH may be able to send you diagrams to help if they supplied the system to Beaver.
Anyone else out there know the ride height specs for Arden's '98 Monterey?
