I think I would prefer them just to go on their own once I had recorded sufficient ID, perhaps held onto their own keys and registration, taken their photo, etc. And of course, I would pay attention to any bad vibes I got and be ready to cancel the whole thing. It's not worth it to take a ride with a lunatic. And I would certainly never go with more than one person in the car with me. Meeting at a public place may be a good idea - something like a police station or bank parking lot. If not, I would meet them on my driveway with the garage door closed and never let them into the house.
That may sound extreme but I've known a lot of people who are very poor judges of character and have a poorly developed intuition for reading people.