Vehicle noise, vibration and harshness (NVH) problems can be analyzed using numerical methods such as finite element analysis, which is generally complex and time consuming. In order to speed the analysis and reduce the calculation burden, this paper discusses the development, use and verification of an enhanced, simplified numerical acoustic cavity modeling approach for the analysis of vehicle NVH problems. The proposed simplified vehicle model can incorporate multiple acoustic cavities, such as an engine compartment, passenger compartment, and connecting bulkhead compartment, joined by several flexible panels. The damping matrix of the model is constructed from measured acoustic absorption data and panel properties. Utilizing this modeling approach, both single-cavity and three-cavity models are created, different floor panel configurations are investigated, and transfer functions predicted by these models are compared with corresponding transfer functions from measured data. More specifically, airborne noise created by the structure-borne road noise vibrations introduced into the passenger compartment floor is observed from the perspective of the vehicle occupants. The transfer functions representing the road noise transmission path are determined experimentally and compared with model prediction results. The comparison results imply that the developed simplified model provides reasonable accuracy for the analysis and simulation study.