Rams with rust

Same problem here. Mine is an 05. Started to rust last year right above the tire and boy does it piss me off. Now will end up replacing bedsides after winter is over. I was told they put "foam" in the bed for sound deadener and that is what causes it to rust from the inside out. It is a damn shame you spend so much for these trucks and the time to maintain them so they look and drive like new and they do this. I will drive this truck until the wheels fall off then put new ones on.