A lightweight convertible cargo carrier cart system and accessories adaptable for transporting articles using a vehicle's receiver hitch, or wheeled hand cart, or trailer (pulled via a bicycle or other device). Users can select appropriate components to manage loads based on the available method for transporting the load. Accessories include a handle accessory, a leg/foot accessory, and inserts (for attaching wheels, hardware, and accessories). When the convertible cargo carrier and cart system is used as a cart the user is afforded a variety of positions for installing inserts and wheels based on the weight, mass, and distribution of the load.