that screenie that keeps put up, looks literally like sandbags lining a wooden floor spline, kinda sunken into the ground. I dont see how that would effect tank pathing at all.
it creates an issue because the tank does not "know" there are height differences there. it thinks it can crush the sandbags so it will try to drive straight trough. when its on top of the sandbags and it notices the height difference, tank gets stuck and people go rage. the same thing happens when you crush hedges(as u can notice in schijndel, bottom of the town) or walls (as u can notice in red ball express)
without sandbags the height difference is still an issue btw, you can see the edge is not really smooth from the picture.