The Heavy Truck Rollover Characterization Study - Phase-B builds on the results of prior phases of research. Phase 1 and 2 (Funded by Federal Highway Administration) involved heavy truck rollover characterization for a tractor and box-trailer; and Phase-A involved the characterization of a tractor and flatbed-trailer. Phase-B of the Heavy Truck Rollover Characterization Study included on-track testing utilizing New Generation Single Wide-Based Tires (NGSWBTs) and standard dual tires; the use of a Volvo VT830 class-8 tractor (the same tractor that was used in Phase-A); the use of three LBT tanker-trailers (two for characterization and one for test-track testing); and a Bendix Electronic Stability Control (ESC) system on the tractor and tanker-trailer. Characterization was conducted by both Michelin and WMU. The standardized torsional stiffness testing developed by Michelin in Phase-A and the procedure developed by WMU were utilized for characterization of the respective tanker-trailers at Michelin and WMU. The tanker-trailer at Michelin was also characterized on Michelin's Kinematics and Compliance (K&C) test rig. The purpose of the characterization efforts was to generate detailed K&C data about the tanker-trailer that could be utilized in selected vehicle dynamics model. WMU also continued with the development of their solid, finite element, and kinematic models, and will apply them to make initial design recommendations to be considered in Phase-C of this research,