EMP will completely fry any modern autos or trucks electronics. Don't even try buying spares to get them back up and running, unless you are independently wealthy and have a real attachment to it. GPS will also be toast. Forget the internet too. Power hand tools no computer controlled will be fine, as will batteries. Believe it or not the military isn't as hardened as one would assume, they will loose most of their capability too. Your best bet is to go old school on everything you can. A horse, a bicycle, or an extremely muffled older auto/truck is the way to go.
I spent to much time using my dick skinner's to repair military electronics to have much faith in any modern electronics surviving in either civilian or military hands.