Abstract: A collapsible support structure includes a horizontal support structure, a vertical support structure, a handle assembly, and an axle assembly. In use, the collapsible support structure may be folded/unfolded between a deployed configuration, in which the collapsible support structure may be capable of rolling along a support surface to transport items, and a stowed/storage position, in which the collapsible support structure is collapsed in a compact geometry for storage. The collapsible support structure includes an axle assembly that enables removal of the wheels from the axle assembly for storage, as well as a handle assembly that can slide completely underneath the horizontal support structure for storage and when not in use.

Abstract: A collapsible support structure includes a plurality of platform assemblies, a handle assembly, and an axle assembly. In use, the collapsible support structure may folded from a deployed position in which it rolls along a surface to transport items, to a stowed position, in which it is collapsed in a compact geometry for storage. The collapsible support structure includes at least one support member removably coupled to one of the platform assemblies.

Abstract: A cart includes a platform assembly, a handle assembly, first wheel assembly and a second wheel assembly. In use, the cart may folded from a deployed position in which it rolls along a surface to transport items, to a stowed position, in which it is collapsed in a compact geometry for storage. The cart may be further integrated into a chair, chaize lounge, garden cart, bicycle utility cart or a bicycle passenger cart.