Cracked Weld

Can you snap some pics of where the issue is? Hard to completely understand from your description. Is the weld structurally integral or is it just a joint?

I would prolly try to find a local welding shop and have them fix it if u dont have access to a good mig or stick welder if its as heavy as u make it out to be im sure it made of some pretty thick gauge steel therfore i doubt that a harbor freight mig would do a very good job i have never used one but have used some other no name mig welders and i wasn't very impressed at all..

if you dont have experience, do your self a favor, degrease and wash the area and stop by a local shop....cleaned up..is the trick..and roll back down the road...