Embodiments herein provide a support structure for a radial conveyor. The support structure may include first and second wheel assemblies that may be selectively rotated between a travel position and an operating position. The support structure may include a drive assembly having a motor. The drive assembly may selectively engage and/or disengage the motor with one or more of the wheels of the first and/or second wheel assemblies. In some embodiments, the drive assembly may include a pinion coupled to the motor, and an actuating arm to selectively engage and/or disengage the pinion with a ring gear coupled to a first wheel of the first wheel assembly.