An improved shopping cart with a floating basket. The system includes a wireless communication system capable of setting up dispatch communications links between subscriber units and a dispatch server. Relatively large message units may wait for communication over the channel in a queue, and be released when prior messaging is complete. Because of its modular design, the arched ramp may be assembled using varying numbers of component step-links, thus providing a user with the flexibility to form a ramp assembly with lengths suitable for different particular applications.