Hey guys, Anyone with a 08,09 extended cab,watch your rear doors for water leaks.Brought my 09 to the dealer because found water on th floor in the back,water was coming from interior door panel.Dealer found that window seals are poor design,allows large amounts of water into door core,and drains out holes in bottom of door.A(weather0 seal is applied to inside of door,but with that much water goinig into door it splashed against weather seal allowing water to leak to inside.They replaced the seals but they are of poor design ,and still allows considerable amounts of water into door.I'll be contacting chevrolet to push this issue! watch your trucks