Actually we just recently got a bucket/chipper stuck in a steep snowy driveway. Too risky to back down with the chipper attached, if the truck slid at all we would be pretty screwed. So we rigged up two lines on either side of the driveway with rescue 8's and lowered the chipper to the bottom of the drive, using the opposing lines to steer it down. It would have been a great one to watch, had the camera running but the bitter cold weather shut it down pretty early in the process.