+1 for Bob Cross's solution. Do it right the first time or you'll get to do it again, later.
I've always used stick when my life depended on it, because it's easier to get weld penetration. Mig is great for sticking two pieces of metal together where a weld failure isn't catastrophic, or for welding thinner stock.
Be sure your guy removes the paint in weld area. As soon as the weld is completed and the slag removed, paint spray the weldment while it's still hot. If it cools without being painted it will draw moisture into the weld and you'll fight rust forever.
2016 FC 25' FB twin
2013 F-150 Lariat CrewCab 3.5 EB 4X4 3.55 axle