The cars are from NASCAR thunder 2003 the template is different. And got the monster truck from a different game . but made script for it. It's for rfactor
I ran some tests also now the last one is when you export to bob track builder you will get a bunch of numbers. if you make a point for each line you will have the track but no walls or grass.
I say that it's you will need blender version 4.0 or higher to use this . I don't have a good video card so I can't make mods for this game so I'm going to try a different game.