Hook and chain tow trucks are the familiar old-style rigs which use a simple connection to link up to a vehicle, trailer, or other kind of load. Although they were once extremely common, the format is rarely used for general purpose towing today. Attaching the chain to the towed vehicle can easily cause scratching or other damage, and hauling an all-wheel drive vehicle in this way will almost certainly harm the drive train. The one area where hook and chain tow trucks are still widely used is in transporting junk vehicles to the breaker's yard, as causing minor damage is no longer an issue.