2003 with sqeaky box upon turning into driveways

Just wondering if anybody else has this problem. When turning into uneven driveways I hear a fairly loud squeak from the box area. If so, if you know where to start looking. Is it a box mount? Also, my tailgate does not want to latch all the time. I have tried spraying WD-40 in both latches and into the handle area with little help. Any ideas there? Thanks