Earth Anchors, Ground Anchors, Deadman Anchors, have you used one? Which do you prefer?

Earth Anchors, Ground Anchors, Deadman Anchors, whatever you choose to call them, sometimes there simply is no available winch attach point so you must use one. Check out the various types of anchors we have seen used offroad. Note how all of these users are practicing the more secure CLOSED SYSTEM attach point to their anchors. Have you used one? Which do you prefer?