I know the inherent dangers of doing so, chock the tires, drive it up on blocks, etc. New to me RV leaks down on driver side. Lately, I was under the rv adjusting the ride height and noticed the rear driver ride height control valve perpetually leaks air from the exhaust tube, so I bought a new one. My question - when I loosen the air lines going into the rear driver side ride height control valve, will the entire system deflate (all 4 corners) or just the rear corner bag?