Hi guys..... new to this forum. I'm a duramax owner thats looking at purchasing a new Superduty. I've been lurking and doing my homework on the new purchase, but keep hearing about this Job #1, 2 or 3 thats listed on the window stickers. Some people say to stay away from Job #1 and 2's for whatever reason. They want Job #3's. Pardon my ignorance, but what gives? What exactly is this Job thing related too and if it is important, which is the best. Thanks for the advice guys.