Anybody had the rear cab vent leak? I am finding water in the carpet and it looks to be the vents. The things look like they are made to leak....Suggestions appreciated (F-250 Supercab)

 

Check the third brake light and rear window seals.

 

I'd pull away the interior panels to get access and douse the area with baby powder or tape paper to the areas you suspect and douse the outside of the cab with water. Or enlist a helper to do the spraying while your doing the watching.

I've heard of leaking windshield issues. I passed on a nice SD at the dealer when I bought my current one bc there was interior damage due to the windshield leaking.