Abstract: A hang ladder is removably mounted to a trailer by a pair of mounting brackets that are attached to the ladder's side rails. The mounting brackets have a body and an arm with a fixed width slot extending between their upper sections and with a flared end at the open end of the slot. The slot is skewed relative to the longitudinal base of the bracket, and the rub rail of a flatbed trailer fits within the slot so that the ladder is secured to the rub rail on the side of the trailer. A tapered end of the arm can produce the flare in the end of the slot.