I think it is because of some esports stuff. They don't want people manually messing or publishing their content. Those trucks are official ETRC stuff as far as i know (couldn't bother to look up the details don't judge me pls 😁). They will use it for some races probably. It is like Ferrari 488 Challenge cars. They gave some Steam codes for unlocking them.Thanks for the share! It's a fun little pack. At the risk of sounding ungrateful, I wish modders wouldn't use .exe installers for mods like this though...