Originally Posted by a_iexterior
How much movement is acceptable in the king pin?my frame moves about 1/2-1" if I hold the brakes and hit the throttle
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Do a search. You'll find other posts with pictures and remedies. These frames crack at the main crossmembers where the pin box side plates are welded. Lippert (the frame manufacturer) will do nothing to help you based on the year it is to old for them to warranty it.
You need to pull down the fascia and fully inspect the frame.
Here's what mine looked like in Jan. 2014. Sheered cross member and multiple stress cracks. They used material too thin.
You can see how much movement I had in the other pics.