Those that use wool wax or fluid film ?

[OVERKILL]

That's the way most Rams around 08 (that body style) look around here. I have 2 friends that have a 14 ram and a 15 power wagon. Both babied and krown oil sprayed yearly and both needed a new fender just before the warranty on one and just after on the other.

A roommate I had got a new warranty box on his 14. Also undercoated yearly according to him. My friend who's a body shop manager says the undercoat doesn't keep them from rusting because of the inner liner. They all rust eventually according to him, although others claim that's not true (including the one friend with the 14 until his rusted through).

We have a fleet of 2011/2012 RAM's and none of them have fender rust, they were briefly Krown'd but for the last several years have all been done with Rust Check. The guy that does the applications is extremely liberal in how much he uses which I expect is the major factor. I posted a pic of our Laramie that ate a camshaft recently in my thread about it, all of them are that clean and are mostly SXT's without the added fender trim like the Laramie has.

 

[350Rocket]

We have a fleet of 2011/2012 RAM's and none of them have fender rust, they were briefly Krown'd but for the last several years have all been done with Rust Check. The guy that does the applications is extremely liberal in how much he uses which I expect is the major factor. I posted a pic of our Laramie that ate a camshaft recently in my thread about it, all of them are that clean and are mostly SXT's without the added fender trim like the Laramie has.

I believe you about that but I also believe they will rust through eventually. An 11 isn't that old yet in my opinion. Some of it is the luck of the draw too, parts quality variation. I worked with a guy who had a 2010 GMC (worst era for rust on gm trucks in my experience) and his never got undercoated. No rust anywhere except a spot above his windshield. He has over 250k miles on it now.

In the very small group of people I know with Rams, they've all had rust issues and our body shop guy claims they are the worst for rust. He sees way more than the rest of us and I trust his word.

 

[doublebase]

That's the way most Rams around 08 (that body style) look around here. I have 2 friends that have a 14 ram and a 15 power wagon. Both babied and krown oil sprayed yearly and both needed a new fender just before the warranty on one and just after on the other.

A roommate I had got a new warranty box on his 14. Also undercoated yearly according to him. My friend who's a body shop manager says the undercoat doesn't keep them from rusting because of the inner liner. They all rust eventually according to him, although others claim that's not true (including the one friend with the 14 until his rusted through).

Yup, and it traces back even later than 08. The Rams just rot out at those spots...over and over again. It’s a defect.