In this article, Cecil mentions that 2,200 pounds of pressure would need to be overcome to open an emergency exit on a Boeing commercial flight @ 30,000 feet. My thought was: “What about the worlds strongest man event”? The one where they pull a train/plane/semi-truck (how are they SEMI, exactly?). How much pressure are these guys exerting to break gravity’s hold on the peice of equipment? Is it enough that one of them (or two? the buddy system?) could open an emergency door at altitude?
Welcome, Neverest. Ask and ye shall receive: Why are tractor-trailer rigs called “semis”?
Such is the nature of the Straight Dope. (Of course, that wasn’t exactly what you asked, but what the heck, I answer what I can.)
As to the original question, if they are merely pulling the thing, it’s not a question of how much it weighs, but how much friction there is in the wheel bearings. With perfect bearings (made of unobtanium, of course) on a perfectly flat road, an ant could tow a semi.
That’ll limit the acceleration, but would not prevent one from pulling it. The ant pulling the unobtainium semi would take quite a long time to get up to speed (and a similarly long time to stop it), but eventually, it would.
You forgot to specify the theoretium-coated perfectly smooth and level surface for the ant to pull the semi on. Even a very very small bump would prevent the ant from pulling the semi over it.