Longer screws and fender washers keeps ours in place. It's a 2020 320S, so it's not the same as yours, but may offer some ideas. It's not visible from the ground.
Stockton, New Jersey 2020 nuCamp T@B 320S * Jeep Wrangler
@Tjalling, is yours a CS-S (clamshell) model? The upper trim is a bit different on those and your issue may represent a different problem than what others have experienced with the heavy plastic trim (with is just decorative) on the S models.
Looks looks like a clamshell. I believe the black weather strip covers screws in the channel. First time seeing this. I think the metal edging is one, long, solid piece. Looks like it fractured? I would email nuCamp at help@nucamprv.com and see what they recommend. Assuming this is a clamshell, make sure to indicate this so they don’t reference the S model trim issue.
We had the same problem. We carefully puller the rubber seal aside, just enough to get to the screw holding it down. We removed the screw temporary to see what type and length the screw was. We eventually had to put 2 more additional screws in to hold it down and put the rubber seal back in place. I believe we put some adhesive on the screws to keep them from backing out again.
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2020 nuCamp T@B 320S * Jeep Wrangler
"Just Enough"