</font><font color="blue" class="small">( I think physics wouild get you as your anchor has to have at least as much holding power as the thing you are trying to move. That would have to be one _big_ anchor.
Harry K )</font>
Well, maybe not ALL of it - unless the tractor is DEAD and can't contribute anything to the effort at all.
Plows are designed to "cut and skim" and there is a limit to how many of them can be pulled through the ground by any particular tractor. {2, 3, 4, 5 bottom, etc. no surprises there}
Anchors are designed to bury and hold against a horizontal pull, the more you pull the deeper they go. I'd guess 6,000 lb of holding power could be had for ~$100 in something that could be carried out to the rescue site in a gardenway cart - as I said, GUESSING. Anchors are also designed to release easily with a vertical pull, so when you winch yourself to it just pull it up with the 3pt hitch.
Anyway, just a suggestion and I was curious if anyone had tried it. Sailor's call it "Kedging" when they throw out an anchor and winch it in to drag the boat back onto water when it has run aground. So it wasn't an original thought or invention (-: