The HMMWV, known as the army workhorse, has had more study, testing and simulation with active suspension systems than any other military vehicle. Davis Technologies, Inc. has invented and has been involved in the development of compressible fluid suspension systems with low bandwidth active and fully active control systems for the HMMWV and other vehicles. The test results have shown significant improvements in vehicle mobility and stability performance. Current work includes simulations of future vehicles over test courses to analyze performance improvements. Present and future systems are analyzed with these potential improvements by simulating the vehicle and the control system performance prediction and then actual vehicle course testing closes the loop.