Abstract: A wagon frame assembly and a system using the same are disclosed herein. In one or more embodiments, an adjustable wagon frame assembly includes a frame structure having a plurality of frame members, the frame structure configured to fit at least partially inside a wagon bed of a pull-type wagon, the frame structure configured to support one or more objects proximate to a periphery of the wagon bed so as to leave a central region of the wagon bed open for transporting one or more additional objects, one or more people, and/or one or more animals. In these one or more embodiments, at least one of the plurality of frame members is adjustable relative to at least another of the plurality of frame members so as to enable the frame structure to fit a plurality of wagon beds having different sizes.