I have had to "tow a tree" a few times doing that.
Cut a tree down and attach a chain or rope to it and make a drag. You pull it down hill and up hill and the pull on the center of the rear bumper or hitch keeps the rear of your rig from trying to pass the front.
In central Idaho and also in the Sierras a few times I have had to do that to get down a mountain after the snows came in at night. The tree needs to be fairly large to have enough drag and weight to stop the rig from spinning and pulling it in low range you can feel the tires working just to get down hill. Not good for gas mileage, but VERY good for keeping you from going over an edge and ending up in a wreck.
