Character in wheelchair.

I am working on a simulation to show people how it is to live daily in a wheelchair. I have the rigged character and I have the wheelchairs finished. Should I combine them into a single character or import them separately. If I import them as a single character, do I set it up as a vehicle or a human character? If I import them separately, how do I spawn the person in the wheelchair? I have no idea what to do about this. Any help would be appreciated.