1) AAA activity 2) Aaa service 3) Pulling along 4) Pulling along behind 5) Pulling behind 6) Service-station service Found on https://www.crosswordclues.com/clue/towing
Towing is the process of coupling one object to anothers, so that one can be pulled along behind the other. The towing source (lead object) is usually a truck or other motorized land vehicle, but anything from waterborne vessels to tractors to animals to people can tow cargo. The coupling may consist of a chain, rope, bar, integrated platform, or ... Found on http://en.wikipedia.org/wiki/Towing