I have thought about the two rig idea. The oldest kid is 13, second oldest is 11. I guess I could put them behind the wheel soon, but I'm not sure I'd be comfortable with them piloting the other kiddos with them quite yet.
I'm not sure about having the GF drive one or not. I don't have any automatic rigs for her to try as of yet. I would like to take her out and see how she likes it, and see if she can handle it.