Hi we may buy a car in a private sale in NJ. What is the easiest way to drive it back legally to PA. Do I have to go all the way home and register the car first ...then back to NJ to pick the car up and drive it home? OR can I just grab the plates from one of my cars here and use them to drive it back....but the registration won't match...so I am guessing...no easy way for me to do this????? I just hate doing an extra trip if I dont have to! Please advise?