Went to autopark (parallel) yesterday; wife driving so I had a good view of the front corner. Parking behind a small truck with an extended tray just at the level of the top of the front corner. The car would have hit the back corner of the had we not aborted the park. The truck was a similar configuration to one I backed into months ago. Basically the sensors don't seem to see an extended tray that's at the head/tail light level on the Tesla when there is nothing under the tray.