A method for attaching a rear frame suspension module to an existing vehicle that will operate on the existing automotive engine, heating, and cooling system. The rear frame suspension module supports passengers sitting straddled in a front to back position to give an existing vehicle a motorcycle-like appearance. The rear suspension module can be attached and removed from an existing automobile front frame suspension module. The resulting wider front structure of the vehicle makes for safer riding compared to a two wheel motorcycle. Vehicle maintenance can be done at most automotive repair shops.