A lighting apparatus for connection with a trailer includes an elongated housing having an upper end and a lower end adapted for connection with a post, and at least one sidewall. A mounting assembly is connected with an upper portion of the elongated housing and a light is connected with the mounting assembly. The housing has an inner chamber for receiving a wire harness and/or power source for the light. When the elongated housing is connected with a trailer frame, the light faces a rear direction relative to the trailer and is operable to illuminate the area rear of the trailer.