Looking at the Tooner’s implementation:https://youtube.com/watch?v=8_ky9LhbxZI
Tracks animation looks really good, they bend over obstacles and imitate tension of the track. Not sure how exactly he did it, most likely by tracing against ground between roadwheels and adjusting height of the control points if track is not too tense. On the top, most likely some pre-defined points are relaxed if track is not tense. Should try implementing something like this. One could actually test collision of the roadwheels against the spline instead of the ground. Would eliminate most of the issue with getting “stuck” in obstacles and ride should be smoother.