I have a 2017 Larime and have had the same issue over the past couple years. Every time I take it in (been 4 so far) never find the issue but have replaced a couple items. Last time they replaced the Evap Canister Assembly. Will be running out of the factory warranty soon so hope this fixes...
I have the MX4 on my 2017 Larime with rambox. Minor leak near front and sometimes at tailgate with hard driving rain. Overall I like the look and ease of removal when I need the full bed.
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