I noticed this a while ago, but I'm not sure if it was there when we bought the van new.
Whenever I go over a speed bump, even if I'm going under 5 MPH, I hear a slight groaning noise when the front goes over the bump. The rear does not make this sound. It sounds suspension-related, but I have no idea. I just wanted to see if anyone else has experienced this, or if they know if it's normal.