are they there yet? I think that would be awesome to tow cars or other objects with ropes/belts. especially in multiplayer mode, there is a potential for funny missions. I have seen, there is a winch mod, which sounds already very cool. Missions like: pull contests with two cars to proof who's car settings are better towing missions uphill or downhill with a broken car mission with objects on ropes, the objects manipulate the handling of cars or can even stuck somewhere races with two cars on the same rope that is fixed on the rear, the first car have to drive not too fast, the last have to drive fast to not to be turned around I think there is more fun to discover...
Well, you have a chain prop officially and there is a rope mod on the repo. Other than that I don't think there is anything else for now.