This application describes carts having a single vertical frame supported by a tripod-like leg structure. They are collapsible, extendable, and able to accommodate a wide variety of different accessories. To add accessories, carts can include one or more coupling components. Each coupling component includes at least one clamp that can be tightened around a cart's vertical frame along with a female coupler and a male coupler. The female coupler can be attached to a clamp and a male coupler can be attached to an accessory. The male coupler features a v-shaped extrusion and the female coupler features a complementary v-shaped intrusion allowing the male coupler to couple with the female coupler so that accessories can be added to the cart in a cantilevered manner.