A vehicular body and frame assembly includes a plurality of individual frame modules that can be selectively connected together to form customized assemblies. Each of the individual modules can be constructed in any desired manner. To connect the modules together, each module has cooperating first and second connecting structures provided thereon. The first connecting structures are designed to connect to the second connecting structures. For example, the first connecting structures may be formed as hooks provided on the lower portions of the frame modules, and the second connecting structures may be formed as pins provided on the lower portions of the frame modules upon which the hooks can be engaged. The frame modules can be connected together in this manner and pivoted to a mating position, wherein they can be positively retained together by bolts or other fasteners that extend between the mating frame modules.