Ok guys I am looking for truck size recommendations for hay delivery needs. Currently I am running a 2008 F450 drw crew cub 6.4 diesel 4wd. The motor was just replaced with a studded head new turbos and egr delete new transmission was just replaced last month. My combine GVW is around 37,000 to 38,000. I was told this truck is hauling too much weight and that is why I am having issues with the cross over exhaust blowing out (3 times now). Thoughts??????