I decided to have a little fun, and see if I could park the jeep on top of the MAZ and drive around with it on top. The answer was yes and no...
Here's what happens when you drive over the top of the MAZ...
I was able to get it parked on top...
But apparently the graphics engine can't move both vehicles at one time....
The jeep looks funny stuck to the wall like that...
I also found out how to reset the terrain if you tear it pretty bad with the trucks. Uninstall and reinstall did nothing. I found a folder in Windows 7 called {UserName}/AppData/Roaming/SpinTires/ that holds four files - Config.xml, MeshCache.mhc, ShaderCache.sdc, and UserConfig.xml. Delete all four files and the program will recreate them and start you from the beginning.
There is also a folder called Shots that holds .png files that are the screenshots you get with Print Screen. That's where my screen shots came from.
I don't know how successful this game will be, but I've already caight myself playing long after I should be in bed. Isn't that the sign of a good video game?