Pueblo falls in a cold, severe climate band, and that matters more for panels than people assume. Steel contracts in the cold and expands in summer heat, and that repeated cycle works at any seam where a panel has already been dinged - a small dent that wouldn't matter in a mild climate becomes a spot where moisture collects, freezes, and widens the gap each winter. Add in housing stock that's mostly from the 1960s and 70s, and you've got a lot of doors built before galvanized coatings and factory-sealed seams were standard. Those original panels have had fifty-plus winters to accumulate rust from the inside out, starting at the bottom where road salt and snowmelt sit longest. We also see impact damage - a car bumper, a basketball, a gust that catches a door mid-cycle - but on the older stock, the freeze-thaw rust is usually what turns a cosmetic dent into a panel that's actually failing structurally, buckling under its own hardware rather than just looking bad.