A motorized-generator power system utilizes a constant-speed internal combustion engine to operate an electric generator. Electrical power from the generator operates an electric vehicle drive motor as well as charging a battery power pack. A drive motor controller provides control over the rotational speed of the drive motor and stored electrical energy in the battery power pack may be used to power the vehicle drive motor when the internal combustion engine is shut down. A suspension system is also provided to raise and lower the vehicle for clearance and flood-avoidance requirements.