My understanding is that the low and high bocage blocks movement in CMBN. CMRT and CMFB both have low bocage (but not high) except it does not block armour. Having said that if you want your armour to cross it you need to place a order way point just on one side and the next one just on the other. Otherwise the pathing system might decide to go around or through a gap some distance away.
When i am trying to get vehicles to cross any obstacle I always place a way point around 5m away from the obstacle and another way point 5m or so on the other side. That tells the TacAI "I want you to drive through / over this". I do this for streams, hedges, walls, bocage etc. So, also for jeeps, trucks etc. not just tanks.