This will also help when try to fix a high or low spot we have a tool that we use/well a system call heat friction where u heat the high spots till they turn Blue NOT RED to the point of melting then cool it fast this will shrink the high spots and tighten the metal you can do the same with your oil canning from the bottom of the cab You can also shrink that with your mig welder by useing LITE Tacks and cooling with ICe cold water You start by making small Lite tacks around the out side working your way to the center till it is flat .Hope this helps.
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NovaMan/Twisted6