Some times the simple old ways are the best.
We've all seen it, someone gets stuck, someone else backs in to drag them out and gets stuck as well, lots of snatching and pulling until both are stuck beyond hope, and it's getting dark. This can go on until 3 or more vehicles are stuck, then along comes the old country sort with his old jalopy, backs up to the lead vehicle at a 45 degree angle and hooks up.
Spin 'em all up he says and proceeds to pull the lot out in one go, seemingly with no effort! What he has done is to pull the first one off to one side out of the ruts and onto better ground, before the next one starts to move. So then as the slack is taken up there are two doing the pulling and so on and so on.
Then he leads every one off down the pub, you know the rest :-D
I was told this trick by an old tractor driver many years ago, it still works.