The invention is an apparatus for simulating attributes of a vehicle during a certain inertial event. The apparatus comprises a rigid shell, an occupant compartment surrounded by the rigid shell, and a carriage supporting the occupant compartment and the rigid shell. The test apparatus transforms the vehicle into a system of reusable components. The rigid body shell eliminates damage to body components by protecting the occupant compartment. The invention also provides a method of simulating a tripped rollover event of a vehicle with the test apparatus and a cart.