[@Archangel2125] Wheeled cars do exist but they are far more advanced. 

[@Catchphrase]Go as Dark as you want my friend. We are all adults here,.. if anyone complains about it being to brutal they can leave.

 Also if you want to encounter any of the creatures during one of your "Jobs" Go ahead. Perhaps one beats you to a collection and has killed everyone at the store. Again be as gorey as you want with the scene to if you decide to have one.