Have an '03 V8 AWD, bought used 4.5 yrs ago with 75K on it, now at 133K and frame is hurting from rust. Pass side under front door rusted through from inside ( see my garage for pics). I have raked about a pound at least of rust from inside the frame on that side with a coat hanger.
If we could see the inside of our frames we'd probably really freak!
Just did some scraping, wire brushing and painting to the cross members yesterday, not a fun job! If it wasn't for this I think this 4R would last another 10-12 yrs, but I think the frame is going to take it out, but it's not near as bad as some pictures I've seen on here.