hmmmmm we have a rural mailbox....in the middle of a line of about 30. None of them have been hit like that. Pure luck I guess.
I wonder -- if you put a cement pillar on either side, with reflective tape on it, if that would stop the vandalism. The reflective tape can be seen, so they can't say you hid it. They've put those up next to some electrical box (size of a dog house) on a corner here. We've had 3 cars miss the corner and ram into it and knock the whole subdivision's electricity out for hours. They put up wooden pillars here. It's just an idea!