I would have to add, and I know it is now very late on this but I missed this thread the first time around, but as the vehicle is supposedly moving down the road there should not be so much track sag. The pulling motion of the driver wheels would pull it taut along the top run.

This is allegedly BOB and I can't reference the camo pattern , dang I can't even make one out .
This can't really be taken as a given fact , this was something I found and was posted by someone else on another site which I can't remember either .