Here are some other things you should take with you.
A good flashlight
A magnet, to check for excess bondo on quarter panels.
Cardboard and or an old blanket to lie on, while checking out the underside of the vehicle.
Handheld mirror, one with and extinction for those hard to see places.
A friend you trust to point out and spot, things you may overlook.
Also, do your homework on what it cost to replace/repair things that are damaged and or missing. You would be surprised how much money you will spend on trim pieces, or one only parts.
Good luck with your purchase.