Yes, I've had this problem. It seems that water gets into the pivot, causing the sticking. I usually do not have problems, as long as I'm swinging the tire rack and storage box on a regular basis. I always wash my van after each trip and I leave it outside in the weather. If I do not operate the swing mechanism for a while, at least one usually sticks, some times so much that I cannot move it very much. The only lubrication I've done is to spray around the top and bottom of the pivot point with Blast. After spraying, I usually see water being forced out of the pivot. It can take some working back and forth to get the lubricant to be effective, but usually I'm able to get the pivot to move much more freely. I have wondered if there is a better way to lubricate this mechanism and whether there was some routine maintenance that I need to be doing. My Sprinter is also a 2017. Have you gotten any information on this problem from Aluminess or Sportsmobile.
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