Effective passive countermeasure design for rollover injury prevention requires thorough understanding of the occupant response in rollover impact. Thus, the dummy biofidelity in rollover crashes is important. To evaluate the dummy biofidelity a test buck was developed for a variety of surrogate biofidelity analyses. The buck was designed to mimic the geometry and inertial properties of a modern strong-roof vehicle. It consisted of two major parts:​ a deformable, replaceable greenhouse and a rigid base. The goal of this study was to show that the greenhouse structure proposed in this paper, when loaded in a static roof crush test (similar to FMVSS 216) reaches the strength-to-weight ratio level of real vehicles and when loaded in a dynamic rollover test, the roof deformation matches deformation magnitude and shapes observed in the vehicles from the current United States (US) fleet. To achieve this goal a multi-step design approach was used, including a quasi-static roof crush test and a rollover test on fabricated prototypes of the buck roof structure. Based on the gathered data, modifications were introduced to the roof design to improve the greenhouse mechanical response, both dynamically and quasistatically. Once the design was fixed, one additional static and twelve dynamic rollover tests were performed and roof structure deformation was compared to the measurements made on two late-model US-market vehicles (an SUV and a mini-van), tested in similar conditions. The roof exhibited a desired response under the quasi-static loading with the peak value (61.1 kN) within first 127 mm of platen motion, which resulted in the strength-to-weight ratio of 3.76. During the twelve rollover tests the magnitude and shape of the buck roof deformation were consistent with those measured on the two test vehicles. In the twelve tests the maximum resultant displacements of the trailing side A- and B-pillar (after excluding three outlier tests due to welding defects) were as follows:​ 189-223 mm and 183-222 mm, respectively. The component displacements of the Bpillar were:​ between 165-198 mm in SAE Y and between 84-106 mm in SAE Z. The results of this study showed that the designed roof structure can match the deformation magnitude and shapes, including the prevalence of greater lateral than vertical displacement, seen in the current US fleet vehicles. The roof developed in this study has a quasi-static response similar to that of real vehicles loaded in a FMVSS 216-like test. It mimics the stiffness of real vehicle roofs under static and dynamic roof crush loading, and thus it can be used with the test buck to simulate real vehicle rollover crashes to perform parametric analyses and evaluate dummy biofidelity.