Wow - took them a while to whittle a new frame. Better fix the brakes before it bends the frame bouncing off that wall...!
A friend of mine is going through a similar thing with his Chevy pickup - brand new, vibrates like mad. They've had it for the last 5 weeks, checking/replacing all sorts of things. Seems to be a problem with the new models, lots of others having same issue. Latest theory is the transmission fluid was not too compatible with the new bigger transmission they offered, doing all sorts of behind the scenes 'service bullitens' rather than a recall, he still does not have it back but is looking into the lemon-law to get them to buy the thing back. He's had 5 different loaners, the loaners keep getting recalled for other problems (and they are not even the same model of truck).