Ok, I thought it was the hydraulic slide but you have the electric Schwintek. I have two of those on mine and there is a sequence with running the slide in and out a few times and holding the button which you can get the exact details on the Schwintek site to align them if it's the sides of the slide that are not closing tight.
Now...If it's the top and bottom there is some lower roller adjustment but not an easy task.
Steve
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2014 36FL Redwood pulled by 2015 GMC Denali 3500
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