Wow, they are seriously steamrolling you! Already, the other dealers should have helped you. I bought my truck over an hour away and have been dealing with my local dealership since day one of my problem. 5 trips so far. They have been nothing but awesome and have done everything they can, these words came out of my service managers mouth. If I were you I would look into the lemon law in OK. Make a detailed log of everything that has happened and how they are turning you away. Try to record some conversations if you can. Take a video of the vibration and another in a different car on the same road to show them the road isn't the issue. I would also ask if a statement from a certified machanic about the problem would help your case to show there is a problem. We saw another rally 2 (exactly like ours) parked twice at a machanics and stopped this last time to talk to the owner. The machanic WAS the owner and he said it's not normal, but he's living with it. He only tows on the highway so he doesn't care...... I guess since he can fix it himself after the fact he doesn't bother with reliability? ANYWAYS, if your Lemon law procedures are like here in FL you will go in front of a board with GM and they will decide what happens. Hope this helps!