mebored

I get suspension squeaks going over speed bumps in my new 2007 Deluxe Mustang with V6 and auto. Is this something the dealership will say is normal, or is this a justifiable reason to bring it in under the warranty? I already had it in once for a swerve motion on the highway and they found all four wheels were (in the words of ther service tech) way, way out of balance.