We purchased a 2018 Forest River Rockwood Windjammer 3006wk from a private seller on July 17th, 2021. Within less than five minutes of picking it up, the exterior kitchen door popped open, and hit a brick mail box near the side of the road. We are sure the door popped open, because the awning sticks out further than the door, and it was not effected. After the incident, I found a Windjammer forum with a post from another person who had issues with this same door popping open while the trailer was in motion. This was not a busy road, however if this had of happened on a highway or busy area, it could have caused serious injury. There was minimal damage to the mailbox, however extensive damage to our just purchased trailer. The exterior kitchen door was completely ripped off and unsalvageable. It is obvious that it had popped open, based on where the door shows impact. Also, when the door made the impact, it tore a small place in the side of the trailer body, again making it obvious the door had been pushed up and to an angle at impact. The front of the cabinets in the exterior kitchen flew off, and the refrigerator came open causing shelves from inside to shatter in the road. Therefore, in addition to the door being ripped off, there were a lot of debris flying out with it, which again could have caused serious injury. The trailer is available for inspection, however we will not be moving it again. Someone would need to come to trailer. Safety was put at risk becau