Slim represents the owner class, the upper class of the book. He does not consider himself on the level of his men. He tries to separate himself from them, because they are beneath him. He is in charge, and he wants power and money. He wants to keep a separation between himself and his hands.
Slim, the mule skinner, has a more permanent job; he is no bindle stiff. That he is superior to the other men is evinced by how he stands in the doorway, but no one pushes past him; after being seated, he stands up "with dignity." He has "God-like eyes" that see more than is visible, and he hears more than is bein said. In fact, Slim has the right over life and death. He can decide who will get a pup from his dog; furthermore, it is Slim who gives the decree on Candy's dog's death. And, it is Slim who decrees that George "hadda do it" when he has shot Lennie. So, while Slim understands George and the others' alienation, he does not feel it as the others do.
Slim is known as "the king of the farm". He has a charismatic personality and a feeling of self-reliance that make him stick out from the other farmhands. He is a good listener, a hard worker, and seems to be a bit of a perfectionist: Everything he does, he does well.
This being said, we can conclude that Slim simply has a clear vision of where he wants his life to be, and what he wants it to become. People who live with piece of mind are often content with whatever life brings. Slim is one of those odd and rare individuals who simply enjoy the fact that he is alive, and among the living. Also, since Slim is meant to be a foil of the other characters, he is a useful contrast that allows us, as readers, to see the degree of desolation under which the other characters live.
I agree with the first post. Slinm seems to me to be the only character who is actually content with who and what he is. He has managed to get himself into a position where he feels that he is respected and does not need to have any dreams in which he is more in control of his life. So Slim has already gotten what he wants -- the respect of people around him and an amount of control over his own life.
Slim, a subordinate character in Of Mice and Men, does not share the dreams that the other men on the ranch have. Slim does not see the world as the others do.
For Slim, he runs the ranch. While he does not own it, he sees the respect that the other men have for him as something just as equally good. Slim knows his job, is very good at his job, and seems to be happy where he is.
Lenny and George are drifters. Slim is not. Therefore, Lennie and George are unable to be happy until they find a place of their own. Slim has already found a place of his own on Curley's ranch.
For Slim, he is already living his dream. He needs look no further than where he is at.