[mr48chev]

Miller, Linicoln or Hobart are your best bets for a mig for doing body work. The primary reason is that 99.9 percent of electric welders of any and all varieties will need parts and or service at some time and you can get any one of those three serviced at any good welding supply store that ha s a service department without an issue out side of some of the older ones may have parts that have been discontinued but that usually means the unit is really old to begin with. The HF welders don't have any sort of decent reputation and repairs and parts are non existent. Take one into a welding shop for repair and when they get up off the floor from falling down laughing they will tell you to take it back to HF where they will ask you if you bought the extended warranty

I lucked out and bought a Lincoln 175 220V unit off Craigslist from a guy who had bought it, used it a few times to build a couple of things and then decided it wasn't going to be big enough for the new business he and his dad had started. My son who was welding for a living then (he is the shift supervisor now) thought it was a new out of the box unit when he saw it. Having used a stick welder for over 35 years I'm still getting used to the mig.
I primarily use my gas welding torch to weld the sheet metal body panels that I need to do finish work on. I've done it this way for for over 45 years and the gas welded el ls are easier to work after welding. I attended one of Gene Winfields metal working classes last spring and that is what he does most of the time for just that reason. As an example he gas welded two sheets of metal together then beat them into a shape with a mallet and shot bag and then ran that through the english wheel to turn it into a bowl shaped object. No cracking of the weld either.

One thing about learning to weld. Don't start out on your truck. Start out putting pieces of scrap metal together and get to where you get good welds and then build some things. If you are married your wife will be ticked to death if you build her a plant stand or something decorative and you get the practice making something. Rather than spending 70 to 100 bucks or more for a welding cart build your ownWeld up sheet metal scraps until you get good at it and then start on your truck.