These three trucks are essentially the same MTM2 stock Overkill (Ford), Rampage (Dodge) and Executioner (Chevy) trucks. The scrape points, tyre coo'rds and body model placement's are unchanged to preserve superb handling.
The differences from the stock versions besides the colours are that every single vertex has been gone over with a fine tooth comb to close up unwanted body gaps and separate merged verts that caused dull paint reflections. Then all original textures and or mapping was tweaked to better allign texture panels and body sections. Lastly light textures and light sources were altered to more closely match the parent model.
Why did someone do this you ask?
To make some base low vert Ford, Chevy and Dodge models easier and cleaner to repaint. Simply repaint the textures, swap with the originals, rename everything, create a new pod and you're done.