Thanks for all the great replies guys!
1 JPR The bumpers are scratch built, the rollers for the winch too.
2 Ken 5 different shades of acrylic brown and baking soda.
First I shot a couple of light coats of the darkest brown and let them dry, next I shot a very wet coat of the same color and took the soda and threw it down the sides of the truck. Let it dry, then another light coat to "color" the soda. I did this a few times, using the different shades. For the tires I did the same sans the soda, then sanded the treads clean. then some aluminum metalizer on the brake rotors. B)