Think i knew that, though back when i played the campaign it wasn't with any mods and i never had an issue,
though i did play with ECP but not with the campaign or any official scenarios, just scenarios i built in the editor.
Ya makes sense though, so basically as you said dont play the campaign with mods really, most especially ECP.
Amazing how far the series has gone!
The script dynamically searches for all stored textures within the CfgVehicles. Essentially, for all vanilla vehicles (car, helicopter, plane), you should see all available textures as you would in the virtual garage. However, I haven't tested mod vehicles.
I also attempted to add some of the unused textures from BI using CfgVehicleTemplates, but it seems I am too stupid for that.