Wait a minute... It's in derbymutt's content dump! Well, all i wanted was trying it, so ima see what it is. Getting it to repo is probably impossible since derbymutt wasn't seen around since 2018, and he said to not reupload it without permission.
Derbymutt's lexus rx 350 monster truck:
https://web.archive.org/web/20200201035037/http://archives.rigsofrods.net/old-forum-mybb/thread-50.html
Note that he said to not reupload it without permission.
And the download link is dead.
This is the archive of the forum from March 2016 to January 2018:
https://web.archive.org/web/20200206150315/https://archives.rigsofrods.net/old-forum-mybb/
No idea where to look at for older stuff tho.
Ok, i think i found a solution (maybe). Now i have to reinstall blender2ogre (let's just say i broke it in the attempt of doing the opposite) and try another export.
EDIT: Nevermind, same problem.
Rigs of Rods has a (mostly unused) feature for that, the transfercase. it was added in 2020.1. It's documented at https://docs.rigsofrods.org/vehicle-creation/fileformat-truck/#transfercase.
That is not an angelscript command. That's a console command. It's angelscript equivalent is game.setGravity(-9.8f).
Another command similar to that is the game.setWaterHeight(100.0f) command, which i used for my (unpublished yet) flood escape script.
-9.8f and 100.0f are numbers.
There are also...
The mesh was a bit misplaced there. Now it's perfectly centered, and i removed the beam visualizers. Now i somehow need to fix blender not giving me .material files...
So i have different ideas: The first one is to only have footbrakes/handbrake on the front wheels, the second one is to use the new freeforces with angelscript, and the last one is to simply lock the front wheels using some ties or something like that.