Why does Dodge go cheap with their steel?

I have been looking at trucks now for a couple months and I have mainly been interested in Fords but I figured I would check out a few Rams as well. Last night I looked at a 2013 1500 with 56k miles. The truck was perfect. EXCEPT for three rust bubbles on the bed. This truck is not even 5 years old and already has rust on it. That is shameful.