Have you considered decomposing your chain into a right angle triangle with the road (i.e. 1100 N is the hypotenuse)?
I don't have a caclulator on me but this should be relatively simple, once you find the component along the road multiply by the distance (i.e. 1km).
Also note, the answer will depend on if the Truck is accelerating or not. If it is, we need to involve work-energy theorem but if not, the above should suffice.