I was thinking the same thing...or salt/corrosion from East Coast weather...I'm starting to lean that way too.
Multiple codes from multiple systems ---- and they are all electrical in basis.
At this point, I'd forget about the Suspension and focus on looking for generalized electrical problems ---- weak primary chassis ground points and / or wider spread wiring and connector issues (corrosion, for example).
Also, and I hate to even bring it up, but are you 100% certain that your car has never been caught in a flood area ? It does not take very much water to do a lot of damage to a car's electrical systems ---- and it often does not show up until years after