There is a service bulletin out that allows dealers to replace all of them on the 2011s under warranty and I think it covers the 2012s. I would call a dealer out there and see if they can help you out.
I think the bulletin came out summer of 14, but I could be wrong on that. I just know that they replaced all 8 on my old 2011 and that was after they already replaced 3!
It's worth a call and a few hours at a dealer since you are headed up north!!! Never know!
Beau & Sue
2015 Coachmen Catalina 303RLS
2016 Chevy Silverado LT 2500HD Duramax
The more people I meet, the more I like my dogs!