I've managed to chip the pearil white paint on the rear bumper of my 2010 SF Limited three times in a month, once by dragging a cardboard box across it. Have a tube of touch up, but apparently need to protect the bumper with a furniture pad any time I'm hauling anything large. My last SUV lasted 7 years without the bumper paint chipping. This SF is a month old. Anybody else having these problems?