Abstract: A storage system has a relatively unobtrusive mounting plate which is permanently secured to the edge of a vessel's swim platform and removably receives and captively holds a roller assembly. The mounting plate comprises a generally planar rectangular plate configured to conform to the edge shape of the swim platform and includes a generally U-shaped channel extending around the periphery and open at the top to receive the roller assembly. The roller assembly includes a generally rectangular roller supporting plate shaped to fit within the channel of the mounting plate and be captively held therein and a pair of spaced mounting bosses between which there is mounted a roller which extends above the surface of the swim platform for assisting in the loading and unloading of a personal watercraft onto the swim platform. Locking pins extend between the roller plate and the mounting plate for locking the roller assembly in position for use.