I got a big gripe with my car and I don't know if it is common to all Maximas or not.

Sometimes when I drive over recently repaved roads or some surface that has a lot of stone debris, I can hear all the little rocks pinging off the metal undercarriage as if there is no sound insulation at all. It always seems like it comes from the back end of the car more than the front. It makes my car feel so cheap inside. Is this normal for Maximas?