Yea, dead weight would have been a different story. Its amazing what you can pull if you have the help of the stuck vehicle.
I was plowing a few years ago we had a pretty good storm. Dumped about 10" of wet heavy stuff. There were two building kinda close and a bunch of truck docks on a bit of a down hill angle along the side of one building. The way the wind was blowing, the area between the buildings was ~20" of that heavy snow. I needed to plow it but had two semi's back there stuck. One backed a trailer down to a dock door, but once he unhooked and lost the weight, he couldnt get out. Another bobtail tractor went to try to pull him out and got stuck.
I plowed a path back to them in my dodge, and pulled them out onto the plowed section one at a time. Didnt even slip a tire.
Now if they were just dead weight, I probably wouldnt have budged them