Had my tail gate pop open twice today for no reason....first time was on an Interstate ....lucky my hand truck and the two 4x4 wood blocks I had in the bed did not fall out the rear of the bed.....I thought that one was just "bad luck" so I ignored it but not more than 1 hour later (as I was hauling a full load of scrap metal in the bed) I heard the tailgate fall open once more as a piece of metal ended up falling out the bed onto the road....lucky it was in the city and the car behind me was not following too close to me....so they just swerved around the piece, at which time I stopped the truck and retrieved the piece....has this happened to anyone else? After that 1st failure, I made sure the gate was fully closed and I pulled on it a couple times to make sure it was shut all the way...however, that 2nd incident then happened. Any advice would be greatly appreciated.