Abstract: A wheeled material carrier convertible for use as a hand cart or as a vehicular trailer. The carrier is provided with side members having downwardly open sockets at their front edges. Interchangeable support member can be readily mounted to the wheeled material carrier. They can be selected from rigid legs releasably mounted in the sockets, a bicycle hitch having forwardly extending hitch members releasably mounted in the sockets, or a utility hitch having two forwardly extending hitch members releasably mounted in the sockets and a central hitch member releasably attached to a handle extending across the front of the carrier.

Abstract: A collapsible wheeled material carrier which folds to a storage position when not in use. The carrier has a frame with transversely folding braces and a folding bottom. It also has a folding extensible handle assembly. The carrier can be hand propelled or moved by a vehicle.