Why does Dodge go cheap with their steel?

I had m1994 silverado rustproofed and undercoated before i drove it off the lot. Spent one winter in N.J. very mild winter. Light dustings of snow. No road salt. Aug 1995 i beat feet to Texas and never left. Body is still rock solid. Paints burnt off the hood and roof from the brutal sun we have though.

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That's the same basic truck I drove to 642K before giving it away to a kid. Mine was a white Cheyenne. Incredible truck. Was happiest at 80+....The faster the better.