mac,
If you went with the Westin platinum stainless running boards they have a lifetime warranty against rust, corrosion, and pitting. Just keep your original paper work.
Alright so it has been about 5 months... At the way I roll, I would have over 12-15,000 miles on that bad boy already! You have some catching up to do. LOL! I bet I will pass you up again with my next Duramax at the rate you drive...