Big rocks texture glitching and vehicles get stuck in the rocks

i have had quite a few issues, on the map The Island, specifically. the rocks at the top of the volcano, especially the huge ones, glitch back and forth between textures and also dont allow vehicles up on them very far before the tires fall into the rock and the vehicle gets stuck in it. this was a problem in the original Spintires as well, and i believe has something to do with how the pressure of the vehicle put on the rock is interpreted.

well it is the CDT or hit box if you will for the rocks. they were never really meant to be driven on. that is why most map makers who do plan on driving on rocks either rework the originals or add in their own custom rocks.