Why does Dodge go cheap with their steel?

I have a 2010 ram 1500. I use the heck out of this truck but keep it very well maintained. I have zero rust what so ever. My friends 2011 f-150 has rust on the rockers and the doors. The last gen Rams did rust out prematurely in my opinion, but this current gen seems to be holding up very well. They all rust. The new aluminum fords won't now, but from all the problems I've seen with people who have them, I would not want one. This current Gen Ram is way above the current Gm trucks and light years ahead of the past f150.