Describe symbolism in The Orchard Keeper by Cormac McCarthy

In Red Branch, an old orchard keeper named Arthur Ownby gets in trouble with the law for resisting the government's intrusion on his life, symbolized by a tank they keep on his property.

In addtion, when Arthur Ownby discovers a corpse on his property and, instead of informing the police, decides to turn the pit in which the body was dumped into a kind of crypt. He covers it with trees to protect it from the elements and, probably, to symbolically separate it from himself.