One problem related to frame rust has been reported for the 2003 Dodge Ram Van. The most recently reported issues are listed below.
In July of 2015, the bracket that holds the steering arm to the frame, on the passenger side, completely disconnected as I was making a turn. This I had repaired (welded) shortly afterward. The frame was disintegrating from underneath me. On 09/02/2016 the frame totally separated where the steering connects on the drivers side, making it impossible to steer. I find the metal that was used for the frame thin, cheap, untreated, and unsafe! 12 years is much to short of time for a vehicle to be retired by a rusted frame! Chrysler has a documented complaint from me about this and of course they're doing nothing about it.