A cargo cart system with a cradle assembly includes a pair of support rails with generally sinuous upper and lower surfaces and at least one cross bar spanning the support rails. The sinuous upper and lower surfaces are maintained in mirrored relation with one another to define pairs of laterally spaced upper and lower support surfaces to support containers in a stabilized position. A method of assembling and retaining containers includes providing a plurality of the cradle assemblies; placing a first cradle assembly on the cart; placing a first row of containers upon the first cradle assembly; placing a second cradle assembly over the first row of containers; and, placing a second row of containers upon the second cradle assembly.