an apparatus for applying separate pulling forces to a structure such as a damaged vehicle body includes a post member formed of a back wall and a pair of side walls . the back wall is fastened to the ground by a supporting chain . a vehicle body is pulled by plural towing chains extending around respective first and second sprocket wheels and fixed to a swingable holding member upon extension of a hydraulic cylinder , each of which is mounted on the post member . the side walls of the post member have a plurality of apertures for receiving shafts of the first and second sprocket wheels , of ratchet wheels , of pawls and of the swingable holding member . the pawls are engaged with teeth of the ratchet wheels which are fixed to the first sprocket wheels for preventing return movement of the towing chains .