Years ago driving my 1995 Saturn SL2 merging onto the freeway, an SUV in front of me kicked up one of those 1" thick black rubber bases from one of those vertical/cylindrical cones. It took out the headlight, front bumper, bent the hood and pushed the right fender into the door. Damn that thing made quite a sound, just glad it didn't come thru the windshield. I went back and picked it up (luckily on the side of the highway, not in the middle) and marched down to my insurance agents office. $2200 of body work later, and no money out of pocket for deductible and not counted as fault, I had a shiney new car. Covered under "road hazard".
Sorry to hear about a fellow 2012 LGT getting damaged, but be happy that it wasn't as bad as mine was.