I don't think that's a good idea as those are only 4 10mm bolts there... and if you do things wrong at the very least you will screw up (as in rip out) nutzerts or welded nuts.. or whatever it is that is there away from the frame and then you are in the world of hurt!
Get towhooks!!! or get a front hitch!!! it's not that hard to put them in and personally..... if you were stuck like that, I would not risk pulling you out so that I do not cause any damage and injuries. Things snap, metal flies and people get hurt! there is a pic someplace on the net of a wrangler with a strap and metal hook that snapped back through the windshield (or something like that). Noone really knows if it's true or not, but as the story goes, whoever was sitting there got his arm cutup or (something like that) with it....
Oh... and if they were able to pull you out by the sway bar, then you weren't really stuck....
Kejtar