My guess is that it all has to do with how much weight is on the slide. Our Rockwood 8289WS had a very heavy slide with the couch, refer, and oven, all with storage cabinets above. That is the slide that moved as we traveled and therefore needed a lock.
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Tom & Renée
2015 Wildcat 295RSX
2012 Ford F-250, 4x4, 6.7 Liter Diesel