Used key fob to open rear liftgate in order to put packages in , liftgate opened like normal I bent in to place packages inside and the liftgate came backdown and hit my head and then went back up a few inches and came back down again hitting my head again before I had a chance to move out of the way. I had to go to the hospital, I had head and neck pain ,to get checked out and was told I wad whiplash.