How to mod RoR: the Wiki
I have opened some Wiki pages documenting the file format used by RoR. This is a bit crude but may interest those that want to fiddle with the game. It is a little complex to create a truck, but it is quite interesting. I will add later sections about the loads and the terrains.
Thanks to his specific physics, RoR has a big potential as a construction game, since you really build piece by piece the structural chassis.
It is in my long-term plan to develop a user-friendly truck editor, but for the moment this Wiki is all you have...