When I open the tailgate I often get a musty smell. It's usually stronger after several days of rain so I know it's moisture related. But I don't notice any wet areas in the cargo area. I replaced my rear hatch a while back and made sure to seal around the 3rd brake light so I don't believe I'm getting any leaks. I also recently took the trim piece off along the rear edge of the carpet. No sign of water or rust but there was a lot of dirt jammed under the lip with the rubber seal. I did a thorough cleaning, hoping that was the source of the smell. No luck. I did a search as I know leaks are a common issue. Couldn't find any threads specific to smell without signs of water though. Thanks for any suggestions.