In our initial Newmar coach (2016 DS 4018) the top refrigerator brackets were inadvertently left off during the build. We also discovered the refrigerator was being held in place by two sheet metal screws in holes drilled in the tile flooring. Over time, one screw broke and eventually the second screw bent which freed the refrigerator. My wife was back making sandwiches as we were traveling through the mountains of West Virginia. She was pinned by the refrigerator when it finally broke free. So, to answer your question, yes the refrigerator will roll out. Fortunately, you know about the issues with your refrigerator and can take action to avoid what happened in our coach.
Allen & Angel
2019 Dutch Star 4369, 2016 Dutch Star 4018 (Sold)
2015 Jeep Wrangler, Blue Ox, Air Force One