Ok guys, here is the result. Now we have three passages, decorated with diverse mud and rubble splats, as Tric recommend before. They provide light cover and even slow down vehicles a little bit, so you wan´t be able to rush from one end of the map to the other anymore. I added some new craters and a few bushes too.
I agree with what Francis said as well, maybe drag marks (like crab mine flail / blown up mine field) would work to insinuate that it provides cover along these points? Perhaps even a small height decrease to give it that "was dug up" look, will help solidify it more for the player that does not see this or understand how things work when it comes to textures assigning cover.
Either way looks great, and I'm glad you are still actively working on this.