2019 f-350 with 8' bed and approx 1000 miles. 1st occurrence: departed a campground towing a travel trailer (after doing 3 walk-around safety check prior to departing). drove 10 miles to nearest gas station before getting on the highway where i discovered the tailgate was down and crushed by the travel trailer. thinking back through my series of events; i was on level ground and did not reach down to disengage the parking brake below the gate release, i had a ground guide back me up out of my spot who confirmed gate was still up prior to departing, key was in the cup holder with no other objects. i reported this issue to the dealer(4 sept 2019). they reviewed current recalls on my model and none were reported. i filed a claim with my insurance and absorbed the repair expenses. important to note, there was a heavy thunderstorm the night prior to departing. 2nd occurrence: (while awaiting parts to repair damages from 1st occurrence) i departed work and just after turning left out of the parking spot still in the parking lot, the tailgate came open unintentionally for the second time during my 2 months of ownership. i immediately noticed it down when i looked in my rearview mirror and no damages from this occurrence.