For the second time in two weeks we had an experienced driver have a 53' 600xxx series container come of the chassis in high wind conditions. The first instance 2 weeks ago has documented photo proof that the trailer went out the rail yard gate with the locks in place yet it came off on a windy area of the highway. Todays crash was identical. Empty box, high winds, container came off. If you pull any of these make sure the pin retainers are undamaged and in correct functioning condition. If not notify mgmt and do NOT take on the street until a good chassis is swapped in place or the retainers have been repaired. Remember, there are NO hot loads or cutoffs or any other reason to move the trailer until it is safe. We have been lucky so far with no injuries to employees or civilians but you can only roll the dice so often.