How do I fix these textures?

I'm not getting any error messages, but there's no textures loading. Rear window has bugged textures as well.


Edit: Fixed it.
Fucking FBX files...

 

Is experimental using FBX?? .....using converted FBX?

 

I had a similar problem. Delete the truck, Back it up first if you did anything you want to keep. then just re-install the game.

- - - Updated - - -

Oh, I just realized that was a modded one, have you saved any previous versions?

 

I've fixed the issue, it turns out exporting a file as a .fbx removes the textures. I actually just redid the cutting the frame short since I had kinda screwed it up the first time. Normals are no longer broken as well.