I own a 2011 Sliverado z71. over the past couple months I have noticed that after a good hard rain my driver side front and rear carpet is soaked. Dealer did a "leak test" and couldn't duplicate the issue. Any suggestions???

Does your Silverado have a sunroof?
If so I am not sure where the drain tubes are on that PU, broken connection or plugged tubes?

There is no sunroof. Sadly i wish it were that easy

Do you think the water is migrating from the front drivers side then getting rear wet as well?
It could be anything from a windshield leak to possible firewall/intake vents..etc
You may have to get inside, while hose is running with a flashlight to see under & up around kick panel upper dash & really try to see any water drops.

sometimes it comes up from the bottom, splashed by the wheels. there are body plugs that have sealant around them that can fail or rust