I moved your material point further out and It finished meshing with 28 million cells. So now it is meshing ok you might want to have a look at refining it and making it more efficient (i.e. fewer cells)
Also, it might be an idea to put rotating walls on the wheels instead of MRF? I’m not sure if they are needed, might be mistaken, though, I have never done a wheel but seen other users use rotating walls.
Hope this helps, anything else just give me a shout.