[imidazol97]

It's likely the soft rear struts because the air leveling isn't tightening them up is making the soft, smooth ,floating ride of your Limited even softer and bouncy.

I put Sensatracs on my 98 at about 45K miles. I didn't want the super smooth expressway ride for 80 K miles. They are still great at 140K miles. I had a problem with the load leveler not pumping up and the car became strange and bouncy with the softer rear end, even with the newer struts.

I'd recommend getting the load-leveling struts and fixing whatever the problem is. Parts from a recycling yard should be available if it's the pump or switches if you don't want to go new.