Here is the flexible tow chain mod for FS 2015.
The chain makes with its individual members a realistic impression. But even more intended for multiplayer or perhaps Course Play, which was not tested)

The chain is ideal for a machine that needs to be repaired or stuck tow. Even with a heavy soils or under poor conditions can you work for example in group bandage and plow. The chain is more dynamic than the tow bar, but still lacks the fine tuning and a better way to transport them.

Important:
- Beta version
- The red end'll have to hitch the front of the tractor key Q
- Then you can pull up slightly and secure with  key X chain for transporting the tractor
- Then press the button X again of use to solve, and go back a bit
- Tug park to the rear of the chain
- Then again sat in the other tractor and press key X
- Thus, both tugs are connected

Known issues v4 Beta:
- If not releases the brake in MP, has the drawn a short gas, then unlocks the brake
- Handling is a bit of getting used to

Credits:
Bullgore, Upsidedown, balogh2003