I want to put an in-dash computer in my rig eventually and surveillance cameras are on my list of must-haves for it. I plan on making it so it will upload videos to me whenever an open wi-fi connection is available. Either that or I'll add a cell connection for video uploads, streaming music, etc. That way, if it is ever stolen or it's wrecked or something, I don't have to worry as much about if I have possession of the Jeep to get the videos.
I know it's overkill, but I think it'd be nice for security, but it would also be awesome out on the trail too.