pulling hogs out

I think that Toyota commercial is crazy. They say they "towed" the space shuttle but they only pulled it. There was no weight on the trailer hitch. I bet they could get a man to pull the space shuttle with his teeth. Put wheels on something and have it on a flat smooth ground that is easy. I have pushed my truck but I am not saying I can push 4,000 lbs or how ever much it weighs. Now when I get my engine out and put it on plywood if I can drag that to the backyard I will say I can pull 1000 lbs. It is all about the friction. Put that 7,000 lbs on a board and have the dog drag it through the grass even wet grass and then you can say he can pull 7,000 lbs. With wheels you just keep a steady pull and it will roll on flat ground.