Why would a drive shaft mount need to be replaced when a truck only has 16000 miles? on 2009 Nissan Titan

Considering buying a slightly used 2009 Titan truck with 16000 miles. It clunks when starting & shudders when driving - I thought it was the tires, but the dealers mechanic said they had to replace the drive shaft mount. Why would that go out so soon? It has a towing package & I'm not sure if it was over used by previous owner. Any thoughts?

Asked by for the 2009 Nissan Titan
it's still under factory warranty, so it must be no charge
to you. who knows? factory defect?