Trucks were a great loophole because you were allowed to have more people than seatbelts as long as every seatbelt was in use. At least that was my understanding of the law.
For me it was sitting on a milk crate in the back of a van. I liked watching the road pass underneath us through the rust holes.
Car seat? No.
Seat belt? No.
Seat? No, not even one of those.