Rigs of Rods (PC)
An Opensource Driving Simulator whit a interesting Physik Engine, in which you can drive Trucks, Cars, Boats, Airplanes, Bus, and all kind of drivable thinks you need,
On the Mod Repo, i found a Orange Unimog 406 whit a doublecap (4 Doors) and tryd it out on the Map "Smal Island" , whit a Trailer from a Bus, its a nice drive, but a bit divicult because the Unimog dosnt seems to have enought horse power for this trailer, which is a bit unrealistik.., but quite fun, even if you fail and you make a crash, this shows the nice damage model of your cars in this game,
There are a lot of bugs, but this is a betha version of the game.., the main things still work, but you shouldn save the scenario if you parket your vehikel on the mouintan street, if you load the game, this will cause a instant car crash ...
i hope for a Pandoraport for this Game, because this would be nice..
http://www.rigsofrods.com/content/