You don't have to have chrome as a secondary color, just get painted bumpers and black wheels (or paint them too). All these modifications for looks are just that, looks, they don't make the truck any faster...
Too often people with blacked out wheels also have some kind of craptastically looking aftermarket wheel on it. They go a bit overboard with the whole look...
Yes, I especially can't stand the ones that have golf cart wheels on them, sometimes only in the rear. What's the point, it's probably unsafe, looks retarded, and the tires only last a few hundred miles.