Air Suspension - lower?

[HHummer]

After adding the Gobi Stealth rack, I found the rear actually an taller than the raised front of the rack. it appears that "at rest" the rear of the H2 sets an inch higher than the front. As a result, the rack is VERY close to the garage door opening at the rear. To make matters worse, the air suspension will often activate when starting the truck to leave the garage. Putting my weight on the rear drops it siginificantally. I beleive that a prior thread stated that the pump will not activate with the door open, but is there any way to force the air to lower. I doubt it, but thought I would ask.