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The UPS truck replaces the Humane one. That I dont think spawns naturally. The Fedex truck repaces the default mail truck.

Hmm, strange. I will look into this to find out why they not spawning. Are they not spawning at all or with default textures. They have the textures spread between a crap ton of files.

@KubiiQ - I am unsure about that. This never happened for me.

@Toad - Make sure you "Rebuild" your rpf file. While still in edit mode, after to added the new textures, go to File -> "Rebuild"