I just purchased a 2001 x5 4.4i with 20" wheels. After noticing my two kids bouncing up and down in the back seat while driving on bumpy interstate bridges or bumpy roads, I am wondering if this is the way all x5's ride. They thought it was fun. I had 3 adults in the back seat yesterday and they bounced around on bumpy roads as well. Kinda embarrassing for me. I have the air suspension and any help would be greatly appreciated.