Late model Chevy and Dodge pickups around here are full of rust, especially at the tops of the rear wheel wells and the back cab corners. I know Chevy has mastered this rust, as their trucks have all rusted in the same places for the last 50 years, through several model redesigns, etc.
I seldom see a Ford pickup with rust. If it does have rust, it is at least 30 years old.
My guess is Chevy is engineered for obsolescence every 4 years, and Dodge engineering is just incompetent.