A refrigerator appliance includes a liner defining a cavity having a back wall and opposing first and second sidewalls. An elongate shelf-support ladder is arranged vertically on the back wall and positioned centrally. A central arm has a rear portion attached to the ladder such that the arm is cantilevered from the ladder. A shelf assembly is supported by the central arm and includes a first shelf surface located between the first sidewall and the arm and a second shelf surface located between the second sidewall and the arm.