Thanks for all the advice... She has a 2000 F-150 supercab, so she has plenty of room. I think she is more worried that the seat wouldn't fit in the back of mine. It is still going to take some convincing though. I told her that if it comes down to it, I would get the rear seat delete kit and bolt a car seat to that... She wasn't too fond of that idea either.
Oh well, we will figure something out... but the stang stays!