Due to shortcomings in vehicle mobility prediction in the NATO Reference Mobility Model (NRMM), recommendations and requirements for the Next-Generation NATO Reference Mobility Model (NG-NRMM) are under development. The limiting nature of empirically based terramechanics and the recent decades of significant improvements to 3D physics based Modeling and Simulation (M&S) capability call for a process to quantify physics based M&S in meeting the proposed goals of NG-NRMM. A verification and validation (V&V) process is demonstrated to quantify the vehicle mobility prediction capability of current state of the art physics based M&S tools. The evaluation is based upon an M&S maturity scale adopted and modified from corporate simulation governance to fit the specifics of vehicle mobility. The V&V process is demonstrated through a set of benchmarks, one for a tracked and another for a wheeled vehicle. The NG-NRMM benchmark efforts have demonstrated an analytical process for evaluating simulation capability maturity levels for M&S tools. More test data needs to be acquired with this specific purpose in mind. However, current results support the conclusion that current industry standard 3D physics based M&S tools are able to predict expected mobility outcomes that will never be possible with NRMM.