Rear sits low to the ground, ride is bumpy,small bumps sounds like rear hit road

It sounds like your shocks are due for service, I strongly recommend you have your vehicle towed if you are unable to drive it to our location for a free vehicle check. Call us at 248-817-5370.

Funny, "It could be your shocks." Do you hear your air ride compressor kicking on a lot? Mine was constantly running and finally gave out. There is a mod kit you can have installed. It bypasses the air ride system and the mechanic will put springs and shocks in. @Revive Auto {snicker}

Its NOT just your shocks in a manner of speaking. I have a 2006 Saab 97x that did the same thing. DROVE ME CRAZY! There were times when the rear air suspension would leak while driving on the freeway or sitting at a traffic light with no warning. Would then end up with that annoying "low-rider" bouncy feel when going over bumps. I went through the system, removed the bags, pressure tested them under water (No Leaks)? Checked all the lines and the pump too, no leaks? I finally got tired of chasing it and found a conversion that replaced the air bags with heavy duty coil springs and new shocks (completely DYI) and problem was solved. No more low-rider, no more having to pull over to wait for the rear to lift. Its been awesome since. Surprisingly the kit was only $250.00 online at www.am-autoparts.com. Their inventory changes often and that have sales often too. Sometimes the entire kit is not available only the springs, but email them and they will tell you when the full kit will be in stock! Hope that helps.