Tow

To draw or pull behind by a chain or line: a tugboat towing a barge.
n.
1.
a. The act or an instance of towing.
b. The condition of being towed: a car with a trailer in tow.
2. Something, such as a tugboat, that tows.
3. Something, such as a barge or car, that is towed.
4. A rope or cable used in towing.
Idiom:
in tow
1. Under close guidance; in one's charge: The new student was taken in tow by a peer counselor.
2. As a companion or follower: came to dinner with a friend in tow.