Okay Guys. You came so close too!
Think Back. What was the most odd thing about G.M. Trucks in the 70s. The Doors were four pieces versus Ford's two Piece doors. What happend when your four piece door gets slammed continually ( Folks slam Pickup Doors even when they don't have too) and the vehicle sits in the weather and gradually succumbs to the vagaries of one particular thing, Rust!
This rust causes a weakness in the door because of the weight of the window glass within that frame. It then over time cracks and breaks at the Weld in the lower door. Wind noise and leaks are the result. I have seen this personally with the many trucks from the city that rotated through our Body Shop!
Never the FORDS ! only the G.M. trucks( G.M.C. and Chevy.) This includes what is called the Suburbans as well. This holds true today. The smaller Chryslers, Kia,Toyota and others have four piece doors. The things get out of alignment in about two years.