My middle son Ben did his 2nd project with the Millermatic 180 I got him. He's going to Texas State U. so doesn't have income at this point. He wanted a bbq pit of his own, with capability to drag to wherever. He found an old 150 gal. propane tank and a boat trailer on craigslist, plus used up some of my materials store.
I had to buy a minimum amount of steel for this thing. My only help on this thing was to consult on design when he wanted, plus funding, of course.
He's cooking some chicken and ribs on there right now.
Pete Keillor