I wonder if you will be interested in this awesome game. It is a game about military vehicles drowning in piles of dirt. It has rich modding community as you can see here http://www.worldofmods.com/spin-tires/ (not really, actually), caring devs and, the killer-feature of the game, very realistic physics to simulate vehicles in harsh environment.
Consider checking out Spin Tires official trailer on Youtube, but prepare to be amazed.
Huh, the sheer specificness of simulators amazes me. YT trailer BTW: