They all rust when exposed to salt and that beet brine junk they pretreat with. I had a 2001 Ram 1500, those were known rust magnets. This one was 99% rust free, it turned out that the original owner was an equipment operator for a large road building company. When they shut down the blacktop plants in November, he loaded up all of his guns in the oversized toolbox in the bed and drove up to the UP of Michigan to spend the winter at his cabin hunting. At least at that time, the people in the UP knew how to drive in the winter and didn't salt or brine, so even though there was plenty of snow, no salt.
When I bought my 16 Ram1500, one reason I chose it was because of how clean the under body and frame was. It was 3 years old and a lease return. Since then, every year it gets a Rust Check treatment and it's still clean.
There is a rust proofing outfit that advertises on FB, they're not local to me and they use New Hampshire Oil Undercoating. I watch the videos, they're usually a minute or two. It's pretty amazing some of the vehicles they get in that are under 10 years old, including a couple of Rams, that they were able to put the point of a chipping hammer through various spots on the frame. Obviously those were going to require some spendy frame repairs before the rustproofing. So yeah, depending on location, they'll still rust. And although the underbody washes help, those videos show that the frame rust comes through from the inside, which the underbody washes don't reach.
When I bought my 16 Ram1500, one reason I chose it was because of how clean the under body and frame was. It was 3 years old and a lease return. Since then, every year it gets a Rust Check treatment and it's still clean.
There is a rust proofing outfit that advertises on FB, they're not local to me and they use New Hampshire Oil Undercoating. I watch the videos, they're usually a minute or two. It's pretty amazing some of the vehicles they get in that are under 10 years old, including a couple of Rams, that they were able to put the point of a chipping hammer through various spots on the frame. Obviously those were going to require some spendy frame repairs before the rustproofing. So yeah, depending on location, they'll still rust. And although the underbody washes help, those videos show that the frame rust comes through from the inside, which the underbody washes don't reach.