Well it is going to depend on a few things:
1) Where is the halftrack located?
2) Is it a rainy day (mud) or a dry day (dust)?
3)How much gear is it carrying or hauling (how deep it will sit into the earth)
Pencil and paper.....make a sketch or idea, and take it from there. Copy a photograph or scene from a movie to help also.
Good Luck Have Fun