Hummer brand becomes supersized millstone for General Motors as Fritz Henderson warns of bankruptcy becoming ‘more probable’ for carmaker The new boss of General Motors has pledged to go “deeper, harder and faster” in a restructuring aimed at saving the ­ailing carmaker as decisions loom over plant closures and the future of the supersized car brand Hummer. At a press conference in Detroit, Fritz Henderson, chief executive, said he would prefer to avoid bankruptcy but that a filing was “certainly more probable” than before the Obama administration rejected GM’s recovery plan. “Our preference would be to use the next 60 days to accomplish [restructuring] out of the court process,” said Henderson