The Towing Chain With Hook is available on the modhub and is not there to make up. It comes with a complete and complex handling of towing. Once purchased, all you have to do is attach it to the tractor to be pulled (gray side) then come into reverse (or forward) with the tractor that is going to pull and hook the red side to it. Once your 2 vehicles are connected, in the help menu, you can choose to activate the steering and the motor in the vehicle to be towed. So when you accelerate, the struggling tractor will also accelerate on its own and follow you, even when you turn. It looks like the Follow Me mod works, but with 1 to 2m intervals between the 2 tractors.
For vehicles that are not equipped with an anchor point, the mod proposes, with the W key, to add a hook to attach the chain to it. A particularly useful mod if you use the “Real Mud” mod, which gets stuck very easily. Note that you can couple several chains but also several vehicles.