you have to go with him to a notary in PA. You both sign the title and the notary signs it and seals it. The truck is officially in your name now. Then take that signed title to NJ DMV and get your new title and registration. Call you insurance company before hand and let them know you just bought a truck and you need to insure it. Give them the VIN number and you should be good to go. It's a bit of a pain cause you have to go to PA to sign the title (notary), then go back to pick the truck up once you have the registration and insurance to pick it up. If you're flat bedding just take it home after the signing. The guy I bought my truck from paid the notary charge, so I don't know what it costs