Like title says. RearTrack doesn't work in current build (B60). Instead, value for it is taken from FrontTrack. Here's a link to original thread about the issue: http://isiforums.net/f/showthread.p...-front-and-rear-seems-not-to-work-(HDV-issue)
Update: It ended up, that only the old naming scheme (FrontWheelTrack and RearWheelTrack) have the issue. The new one, with range (FrontWheelTrackRange RearWheelTrackRange) is OK.
For wheeltrack, there is indeed a bug when using the old variable names as described by LesiU. While the other variables seem to work regardless, we recommend using the new variable names for vehicles as seen in the rTrainer files.