Looking at your pics, it doesn't seem like you would have a good place to hook up a winch. Could you drive a bar into the ground, or is it too frozen?
Folks that have the winches sometimes carry a fluke type anchor and, (or at least), a long rope. 4WD seems easy, generally, when you've put tens of thousands of 2WD miles on these rigs. I carry a small saw (to build beds across mud bogs, if necessary). Paul Bunyan couldn't kill these willows and alders.