i believe if under age 18 the person must wear a seatbelt in the front seat regardless. over 18 not requried in a truck and rear seats under 18 have to wear them over 18 does not. cars require seatbelts for front passengers at all times and i believe under 18 in the rear seat have to wear them aswell but over 18 does not. so all in all to answer your question over 18 in a truck no seatbelt required. under 18 required. this info was told to me by multiple county police officers as well as being pulled over in a car for not wearing a seatbelt on 4 occasions.