Awesome mod, seriously helps me with my...experiments.
Something I would really like to see, is a "Splitter" of sorts, such as 3 chains joined in the middle, so that you could, say, pull 2 pickup trucks behind a semi with a single chain.
I had much fun making trains out of two D-Series Trucks (the steering of the towed Truck, suprisingly, stayed straight).
i also had fun using a Pigeon as a spikeball-replacement (it broke much easier though).
I didn´t encounter any bugs while playing, but I´ll try to provoke some.
One thing I like, is that the chain gets tangled up with the wheel, though I find it unrealistic, that the chain sticks, even if I drive over it with 1 mph.